bluuebunny/crossref_metadata_2025 huggingface dataset:
What Causes Humans to Begin and End a Meal? A Role for Memory for What Has Been Eaten, as Evidenced by a Study of Multiple Meal Eating in Amnesic Patients
Authors: Rozin Paul , Dow Sara , Moscovitch Morris , Rajaram Suparna
Published: March 2003

Although many factors have been proposed and studied as causes of onset and termination of meals by humans, little attention has been paid to memory for what has previously been eaten. We propose that a principal determinant of meal onset and cessation in humans is memory of when a last meal was eaten and how much was consumed. Knowledge that one has just eaten a culturally defined complete meal may be sufficient grounds for refusal of further food. This hypothesis was tested by studying two densely amnesic patients who had almost no explicit memory for events that occurred more than a minute ago, and who, in particular, usually failed to remember that they had just eaten a meal. Both patients (on three occasions each) readily consumed a second lunch when it was offered 10 to 30 min after completion of the first meal, and usually began to consume a third meal when it was offered 10 to 30 min after completion of the second meal. These findings suggest that memory for what has recently been eaten is a substantial contributor to the onset or cessation of eating of a meal.
Reflexive Attention Modulates Processing of Visual Stimuli in Human Extrastriate Cortex
Authors: Hopfinger Joseph B. , Mangun George R.
Published: March 2003

Attention can be oriented reflexively to a location in space by an abrupt change in the visual scene. In the present study, we investigated the consequences of reflexive attention on the neural processing of visual stimuli. The findings show that reflexively oriented attention produces modulations in early sensory analysis at the same extrastriate neural locus as the earliest effects of voluntarily focused attention. In addition, stimulus processing was found to be enhanced at later stages of analysis, which reflect stimulus relevance. As is the case with behavioral measures of reflexive attention, these physiological enhancement effects are rapidly engaged but short-lived. As time passes between the initial attention-capturing event and subsequent stimuli, the extrastriate effect reverses, and the enhancement of higher order processing subsides. These findings indicate that reflexive attention is able to affect perceptions of the visual world by modulating neural processing as early as extrastriate visual cortex.
Subliminal Visual Priming
Authors: Bar Moshe , Biederman Irving
Published: March 2003

Masked pictures of objects were flashed so briefly that only 13.5% of them could be named. Forced-choice accuracy for the unidentified objects was at chance. When the pictures were shown again, about 15 min and 20 intervening trials later, without any indication of possible repetitions, naming accuracy increased to 34.5%. The priming was completely visual, rather than semantic or verbal, as there was no priming of same-name, different-shape images. This is the first demonstration of facilitatory visual recognition priming by unidentified pictures when the subject could not anticipate if, when, or where the previously unidentified picture was to be shown again. A change in the position of the object reduced but did not eliminate the priming, allowing a speculation that the locus of subliminal visual priming is at an intermediate stage in the ventral cortical pathway for shape recognition.
The Effects of “Mandatory Volunteerism” on Intentions to Volunteer
Authors: Stukas Arthur A. , Snyder Mark , Clary E. Gil
Published: March 2003

With the widespread emergence of required community-service programs comes a new opportunity to examine the effects of requirements on future behavioral intentions. To investigate the consequences of such “mandatory volunteerism” programs, we followed students who were required to volunteer in order to graduate from college. Results demonstrated that stronger perceptions of external control eliminated an otherwise positive relation between prior volunteer experience and future intentions to volunteer. A second study experimentally compared mandates and choices to serve and included a premeasured assessment of whether students felt external control was necessary to get them to volunteer. After being required or choosing to serve, students reported their future intentions. Students who initially felt it unlikely that they would freely volunteer had significantly lower intentions after being required to serve than after being given a choice. Those who initially felt more likely to freely volunteer were relatively unaffected by a mandate to serve as compared with a choice. Theoretical and practical implications for understanding the effects of requirements and constraints on intentions and behavior are discussed.
Cultural Psychology: Implications for Basic Psychological Theory
Authors: Miller Joan G.
Published: March 2003

A theoretical argument for the importance of culture in psychological explanation is offered. It is maintained that the view that culture is integral to psychological theory rests on a meaning-based view of culture and on the recognition that culture is necessary in individual psychological development. Research on cognition and on the self is discussed briefly to illustrate ways in which work in cultural psychology is contributing to basic psychological theory. In future research, greater attention needs to be given to developing more sensitive understandings of culture and to incorporating these understandings in the constructs and methods of the discipline. In conclusion, cultural psychology is shown to represent a perspective to bring to bear in all types of psychological inquiry. While building on existing work in the field, cultural psychology offers an alternative vision that underscores respects in which psychological development represents an open, culturally mediated process.
Cognitive Sciences Research: More Than Thinking About Drug Abuse
Authors: Turkkan Jaylan S. , Shurtleff David
Published: March 2003

On May 23, 1997, the National Institute on Drug Abuse and the American Psychological Society co-sponsored a conference titled “Cognitive Sciences Research: More Than Thinking About Drug Abuse.” The conference highlighted important lines of research, both within and outside of drug abuse, that may elucidate the relationships between substance abuse and cognitive processes. This Special Section of Psychological Science presents a compilation of articles from that conference by scientists who are working in the forefront of this exciting new research area. The research questions posed by these articles take the following forms: What are the cognitive and developmental effects (i.e., the consequences) of substance abuse? What are the antecedents or precursors of drug use that render persons vulnerable to taking drugs? How do the effects of drugs, in turn, become antecedents for changes in perception, behavior, and cognition that further enhance vulnerability to drugs?
Left-Hemisphere Dominance for Motion Processing in Deaf Signers
Authors: Bosworth Rain G. , Dobkins Karen R.
Published: March 2003

Evidence from neurophysiological studies in animals as well as humans has demonstrated robust changes in neural organization and function following early-onset sensory deprivation. Unfortunately, the perceptual consequences of these changes remain largely unexplored. The study of deaf individuals who have been auditorily deprived since birth and who rely on a visual language (i.e., American Sign Language, ASL) for communication affords a unique opportunity to investigate the degree to which perception in the remaining, intact senses (e.g., vision) is modified as a result of altered sensory and language experience. We studied visual motion perception in deaf individuals and compared their performance with that of hearing subjects. Thresholds and reaction times were obtained for a motion discrimination task, in both central and peripheral vision. Although deaf and hearing subjects had comparable absolute scores on this task, a robust and intriguing difference was found regarding relative performance for left-visual-field (LVF) versus right-visual-field (RVF) stimuli: Whereas hearing subjects exhibited a slight LVF advantage, the deaf exhibited a strong RVF advantage. Thus, for deaf subjects, the left hemisphere may be specialized for motion processing. These results suggest that perceptual processes required for the acquisition and comprehension of language (motion processing, in the case of ASL) are recruited (or “captured”) by the left, language-dominant hemisphere.
Further Support for a Hierarchical Model of Affect: Reply to Green and Salovey
Authors: Tellegen Auke , Watson David , Clark Lee Anna
Published: March 2003

Green and Salovey agree with us that happiness and sadness are strongly bipolar, and that Positive and Negative Activation are not. However, Green and Salovey subscribe to the two-dimensional circumplex, a model we find wanting. Actually, the problems they discuss arise from the limitations of the circumplex rather than from issues fundamental to affective structure. And they do not consider the evidence, reported in our target article, that supports an alternative to the circumplex: a three-level hierarchical model. In this reply, we take a closer look at the empirical findings supporting this model, and we emphasize its heuristic promise.
Mental Simulations, Affect, and Subjective Confidence: Timing Is Everything
Authors: Sanna Lawrence J.
Published: March 2003

Three studies demonstrated that mental simulations and affect are related to temporal changes in subjective confidence. In Study 1, students' confidence in their midterm exam performance lessened from the first day of class (3.5 weeks before the exam) to exam day, and confidence correlated negatively with upward simulations (i.e., simulations that are better than reality) and negative affect. In Study 2, manipulated upward simulations produced low confidence and negative mood even when the exam was viewed from a distance; students who were forced to think about upward simulations 1 month prior to the exam felt no more confident than did students on exam day. In Study 3, manipulated negative moods produced low confidence and more upward simulations when students anticipated laboratory tasks, and again distal and proximal confidence did not differ. Discussion centers around reciprocal relations between mental simulations and affect, and a possibly integrative account of previous explanations.
Spatial Scaling in Young Children
Authors: Huttenlocher Janellen , Newcombe Nora , Vasilyeva Marina
Published: March 2003

This article examines the emergence of the ability to use a simple map to acquire information about distance in a larger space. It is commonly believed that scaling is a late achievement in childhood. The present study examined the origins of this ability by using the simplest of situations. In two experiments, we presented preschool children with a dot in a long thin rectangle, and asked them to use that representation to find an object in a corresponding location in a much larger sandbox. All 4-year-olds and a majority of 3-year-olds performed well on this task. We present a model that posits a simpler mechanism for scaling than that proposed in the existing literature.
Unconscious Unease and Self-Handicapping: Behavioral Consequences of Individual Differences in Implicit and Explicit Self-Esteem
Authors: Spalding Leah R. , Hardin Curtis D.
Published: March 2003

In contrast to measures of explicit self-esteem, which assess introspectively accessible self-evaluations, measures of implicit self-esteem assess the valence of unconscious, introspectively inaccessible associations to the self. This experiment is the first to document a relationship between individual differences in implicit self-esteem and social behavior: Participants completed either a self-relevant or a self-irrelevant interview, and were then rated by the interviewer on their anxiety. When the interview was self-relevant, apparent anxiety was greater for participants low in implicit self-esteem than for participants high in self-esteem; implicit self-esteem did not predict anxiety when the interview was self-irrelevant. Explicit self-esteem did not predict apparent anxiety in either interview, but did predict participants' explicit self-judgments of anxiety. Self-handicapping about interview performance was greater for participants low in both explicit and implicit self-esteem than for those high in these measures. The experiment provides direct evidence that effects of implicit and explicit self-esteem may be dissociated.
Grasping Visual Illusions: No Evidence for a Dissociation Between Perception and Action
Authors: Franz V.H. , Gegenfurtner K.R. , Bülthoff H.H. , Fahle M.
Published: March 2003

Neuropsychological studies prompted the theory that the primate visual system might be organized into two parallel pathways, one for conscious perception and one for guiding action. Supporting evidence in healthy subjects seemed to come from a dissociation in visual illusions: In previous studies, the Ebbinghaus (or Titchener) illusion deceived perceptual judgments of size, but only marginally influenced the size estimates used in grasping. Contrary to those results, the findings from the present study show that there is no difference in the sizes of the perceptual and grasp illusions if the perceptual and grasping tasks are appropriately matched. We show that the differences found previously can be accounted for by a hitherto unknown, nonadditive effect in the illusion. We conclude that the illusion does not provide evidence for the existence of two distinct pathways for perception and action in the visual system.
The Angular Gyrus in Developmental Dyslexia: Task-Specific Differences in Functional Connectivity Within Posterior Cortex
Authors: Pugh Kenneth R. , Mencl W. Einar , Shaywitz Bennett A. , Shaywitz Sally E. , Fulbright Robert K. , Constable R. Todd , Skudlarski Pawel , Marchione Karen E. , Jenner Annette R. , Fletcher Jack M. , Liberman Alvin M. , Shankweiler Donald P. , Katz Leonard , Lacadie Cheryl , Gore John C.
Published: March 2003

Converging evidence from neuroimaging studies of developmental dyslexia reveals dysfunction at posterior brain regions centered in and around the angular gyrus in the left hemisphere. We examined functional connectivity (covariance) between the angular gyrus and related occipital and temporal lobe sites, across a series of print tasks that systematically varied demands on phonological assembly. Results indicate that for dyslexic readers a disruption in functional connectivity in the language-dominant left hemisphere is confined to those tasks that make explicit demands on assembly. In contrast, on print tasks that do not require phonological assembly, functional connectivity is strong for both dyslexic and nonimpaired readers. The findings support the view that neurobiological anomalies in developmental dyslexia are largely confined to the phonological-processing domain. In addition, the findings suggest that right-hemisphere posterior regions serve a compensatory role in mediating phonological performance in dyslexic readers.
The Genetics of Dietary Experience in a Restricted Natural Population
Authors: Burghardt Gordon M. , Layne Donna G. , Konigsberg Lyle
Published: March 2003

The sources of individual differences in human and non-human animals remain controversial. We demonstrate that diet and genetics interact in determining the ontogenetic trajectory of chemosensory and prey preferences in the common garter snake, Thamnophis sirtalis, a dietary generalist. In litters of neonate snakes from a single small field in an earthworm-ingesting population, initial responses to chemical cues from fish and worm were similar, with zero heritabilities. After 12 meals on fish, however, the heritability of both fish and worm chemosensory responses increased markedly, the change in response to fish but not worm chemicals was heritable, the relative preference for fish versus worm was heritable, and the change in relative preference was heritable. In addition, growth rates on each diet were related to changes in chemoreceptive responses. Such genetic-environment variation that emerges only after equivalent ontogenetic experience may be a factor in responses to environmental change in many species.
Distress Vocalizations in Infant Rats: What's All the Fuss About?
Authors: Blumberg Mark S. , Sokoloff Greta , Kirby Robert F. , Kent Kristen J.
Published: March 2003

Ultrasonic vocalizations emitted by infant rodents are typically characterized as cries of distress. There are two contexts that are known to reliably elicit ultrasound production: extreme cold exposure and administration of clonidine, an $aL2 adrenoceptor agonist. Noting that these two contexts both entail pronounced decreases in cardiac rate, we have hypothesized that the vocalizations are acoustic by-products of a physiological maneuver, the abdominal compression reaction (ACR), that increases venous return to the heart when return is compromised. As a critical test of this hypothesis, we measured venous pressure near the right atrium in 15-day-old rats after clonidine administration. Consistent with the ACR hypothesis, emission of ultrasound was accompanied by large and reliable increases in venous pressure and, therefore, venous return. These results provide strong, direct support for the ACR hypothesis and, by doing so, underscore the potential pitfalls of anthropomorphic interpretations of the vocalizations of infant rats.
Expression Without Recognition: Contributions of the Human Amygdala to Emotional Communication
Authors: Anderson Adam K. , Phelps Elizabeth A.
Published: March 2003

A growing body of evidence from humans and other animals suggests the amygdala may be a critical neural substrate for emotional processing. In particular, recent studies have shown that damage to the human amygdala impairs the normal appraisal of social signals of emotion, primarily those of fear. However, effective social communication depends on both the ability to receive (emotional appraisal) and the ability to send (emotional expression) signals of emotional state. Although the role of the amygdala in the appraisal of emotion is well established, its importance for the production of emotional expressions is unknown. We report a case study of a patient with bilateral amygdaloid damage who, despite a severe deficit in interpreting facial expressions of emotion including fear, exhibits an intact ability to express this and other basic emotions. This dissociation suggests that a single neural module does not support all aspects of the social communication of emotional state.
The Causal Influences of Attributions on Emotions: A Procedural Priming Approach
Authors: Neumann Roland
Published: March 2003

According to attributional theories of emotion, feelings of guilt presuppose that the causes of a negative event are located within the individual (internal attribution), whereas feelings of anger presuppose that the causes of the eliciting event are located outside the individual (external attribution). This study tested whether these attributions in fact exert the claimed causal influence on emotional experiences. The study employed a procedural priming technique in which neutral events were repeatedly attributed either to oneself (internal attribution) or to another person (external attribution). Subsequently, participants were exposed to a negative event that was ambiguous as to its causes. The results reveal that the prior repeated use of internal attributions enhanced the tendency to experience guilt, whereas the repeated use of external attributions enhanced the tendency to experience anger. These findings support the assumption that attributions exert a causal influence on emotions.
False Memories in Women with Self-Reported Childhood Sexual Abuse: An Empirical Study
Authors: Bremner J. Douglas , Shobe Katharine Krause , Kihlstrom John F.
Published: March 2003

Although controversy exists about the validity of memories of childhood abuse, little is known about memory function in individuals reporting childhood abuse. This study assessed memories for previously presented words, including the capacity for false memory of critical lures not actually present in the word list, in 63 subjects, including abused women with posttraumatic stress disorder (PTSD), abused women without PTSD, and men and women without abuse or PTSD. Abused women with PTSD had a higher frequency of false recognition memory of critical lures (95%) than abused women without PTSD (78%), nonabused women without PTSD (79%), or nonabused men without PTSD (86%). PTSD women also showed poorer memory for studied words and increased insertions of non-studied words other than critical lures. These findings are consistent with a broad range of memory alterations in abused women with PTSD.
Visual Capture of Touch: Out-of-the-Body Experiences With Rubber Gloves
Authors: Pavani Francesco , Spence Charles , Driver Jon
Published: March 2003

When the apparent visual location of a body part conflicts with its veridical location, vision can dominate proprioception and kinesthesia. In this article, we show that vision can capture tactile localization. Participants discriminated the location of vibrotactile stimuli (upper, at the index finger, vs. lower, at the thumb), while ignoring distractor lights that could independently be upper or lower. Such tactile discriminations were slowed when the distractor light was incongruent with the tactile target (e.g., an upper light during lower touch) rather than congruent, especially when the lights appeared near the stimulated hand. The hands were occluded under a table, with all distractor lights above the table. The effect of the distractor lights increased when rubber hands were placed on the table, “holding” the distractor lights, but only when the rubber hands were spatially aligned with the participant's own hands. In this aligned situation, participants were more likely to report the illusion of feeling touch at the rubber hands. Such visual capture of touch appears cognitively impenetrable.
Competition-Induced Visual Field Differences in Search
Authors: Fecteau Jillian H. , Enns James T. , Kingstone Alan
Published: March 2003

Do visual field effects point to differences in cortical representation, or do they reflect differences in the way these representations are used by other brain regions? This study explored three attributes of visual search that provide strong evidence in favor of differences in use. Competition refers to the finding that visual field differences in search efficiency are larger in whole- than in half-field displays (both left-right and upper-lower half-fields). Task specialization refers to the finding that some tasks favor one hemisphere whereas other tasks favor the other hemisphere, even though the same stimulus displays are used in both tasks. Anatomical alignment refers to the finding that competition effects are altered if the quadrants of the visual display are not aligned with the conical quadrants of the observer. We propose that visual field specialization in search is the result of a competition involving limited access to cortical visual representations by the extended neural networks of attention.
Shepard's Universal Law Supported by Honeybees in Spatial Generalization
Authors: Cheng Ken
Published: March 2003

An animal that is rewarded for a response in one situation (the S+) is likely to respond to similar but recognizably different stimuli, the ubiquitous phenomenon of stimulus generalization. On the basis of functional analyses of the probabilistic structure of the world, Shepard formulated a universal law of generalization, claiming that generalization gradients, as a function of the appropriately scaled distance of a stimulus from S+, should be exponential in shape. This law was tested in spatial generalization in honeybees. Based on theoretically derived scales, generalization along both the dimensions of the distance from a landmark and the direction to a landmark followed Shepard's law. Support in an invertebrate animal increases the scope of the law, and suggests that the ecological structure of the world may have driven the evolution of cognitive structures in diverse animals.
Separate and Combined Effects of Location Cuing and Repetition Priming on Perceptual Encoding of Words
Authors: Alexander Rebecca , Reinitz Mark Tippens
Published: March 2003

We describe a methodology for investigating whether two manipulations exert independent effects on perception. This method avoids the strong scaling assumptions inherent to traditional analysis of variance techniques, and we used it to investigate the combined effects of cued visual attention and stimulus repetition. Subjects identified previously studied (primed) and new (unprimed) masked words that were presented to validly and invalidly cued locations for varying durations. Performance improved more rapidly with increasing exposure duration for primed than for unprimed, and for attended than for unattended, stimuli. We interpret this finding as indicating that both variables speed the rate of information acquisition. The speedup provided by priming and attention combined equaled the product of benefits for each alone, providing evidence they are serial, independent effects.
Features are Also Important: Contributions of Featural and Configural Processing to Face Recognition
Authors: Cabeza Roberto , Kato Takashi
Published: March 2003

It has been suggested that face recognition is primarily based on configural information, with featural information playing little or no role. We investigated this idea by comparing the prototype effect for face prototypes that emphasized either featural or configural processing. In Experiment 1, participants showed a tendency to commit false alarms in response to nonstudied prototypes, and this tendency was equivalent for featural and configural prototypes. Experiment 2 replicated this finding, and provided support for the assumption that the two types of prototypes differed in terms of featural and configural processing: Face inversion eliminated the prototype effect for configural prototypes but not for featural prototypes. These results suggest that both featural and configural processing make important contributions to face recognition, and that their effects are dissociable.
Amnesia is a Deficit in Relational Memory
Authors: Ryan Jennifer D. , Althoff Robert R. , Whitlow Stephen , Cohen Neal J.
Published: March 2003

Eye movements were monitored to assess memory for scenes indirectly (implicitly). Two eye movement—based memory phenomena were observed: (a) the repetition effect, a decrease in sampling of previously viewed scenes compared with new scenes, reflecting memory for those scenes, and (b) the relational manipulation effect, an increase in viewing of the regions where manipulations of relations among scene elements had occurred. In normal control subjects, the relational manipulation effect was expressed only in the absence of explicit awareness of the scene manipulations. Thus, memory representations of scenes contain information about relations among elements of the scenes, at least some of which is not accessible to verbal report. But amnesic patients with severe memory impairment failed to show the relational manipulation effect. Their failure to show any demonstrable memory for relations among the constituent elements of scenes suggests that amnesia involves a fundamental deficit in relational (declarative) memory processing.
Sex Differences in Mathematical Reasoning Ability at Age 13: Their Status 20 Years Later
Authors: Benbow Camilla Persson , Lubinski David , Shea Daniel L. , Eftekhari-Sanjani Hossain
Published: March 2003

Reported is the 20-year follow-up of 1,975 mathematically gifted adolescents (top 1%) whose assessments at age 12 to 14 revealed robust gender differences in mathematical reasoning ability. Both sexes became exceptional achievers and perceived themselves as such; they reported uniformly high levels of degree attainment and satisfaction with both their career direction and their overall success. The earlier sex differences in mathematical reasoning ability did predict differential educational and occupational outcomes. The observed differences also appeared to be a function of sex differences in preferences for (a) inorganic versus organic disciplines and (b) a career-focused versus more-balanced life. Because profile differences in abilities and preferences are longitudinally stable, males probably will remain more represented in some disciplines, whereas females are likely to remain more represented in others. These data have policy implications for higher education and the world of work.
A Neural Basis for Expert Object Recognition
Authors: Tanaka James W. , Curran Tim
Published: March 2003

Although most adults are considered to be experts in the identification of faces, fewer people specialize in the recognition of other objects, such as birds and dogs. In this research, the neurophysiological processes associated with expert bird and dog recognition were investigated using event-related potentials. An enhanced early negative component (N170, 164 ms) was found when bird and dog experts categorized objects in their domain of expertise relative to when they categorized objects outside their domain of expertise. This finding indicates that objects from well-learned categories are neurologically differentiated from objects from lesser-known categories at a relatively early stage of visual processing.
Six-Month-Old Infants' Preference for Lexical Words
Authors: Shi Rushen , Werker Janet F.
Published: March 2003

Previous work has shown that newborn infants categorically discriminate the fundamental syntactic category distinction between lexical and grammatical words. In this article, we show that by the age of 6 months, infants prefer to listen to lexical over grammatical words. In Experiment 1, infants were habituated to a list of either lexical or grammatical words, and then tested on new lists of words from the same and the contrasting categories. The infants showed recovery to lexical words after habituation to grammatical words but not vice versa. This asymmetry indicates a possible preference for lexical words. In Experiments 2 and 3, preference was assessed directly by presenting infants with alternating trials of lexical and grammatical words, in the central-fixation preference procedure. The infants looked significantly longer during lexical-word than grammatical-word trials. These results show that by 6 months, infants attend preferentially to lexical words. The implications of this emerging attentional preference for subsequent language acquisition are discussed.
Memory Processes and Experiential Continuity
Authors: Gerrig Richard J. , McKoon Gail
Published: March 2003

What are the memory processes that produce coherent representations of temporally discontinuous experiences? In this article, we describe the memory process of resonance, a process that provides renewed access to long-term memory information that is relevant to cues in working memory. Our experiments demonstrate parallel waxing and waning of information as a function of relevance to a current episode, a pattern of accessibility of information that contributes to the achievement of continuity across experiences.
End Effects of Rated Life Quality: The James Dean Effect
Authors: Diener Ed , Wirtz Derrick , Oishi Shigehiro
Published: March 2003

In three studies, we explored how the ending of a life influences the perceived desirability of that life. We consistently observed that participants neglected duration in judging the global quality of life. Across all the studies, the end of life was weighted heavily, producing ratings that contradict a simple hedonic calculus in which years of pleasure and pain are summed. Respondents rated a wonderful life that ended abruptly as better than one with additional mildly pleasant years (the “James Dean Effect”). Similarly, a terrible life with additional moderately bad years was rated as more desirable than one ending abruptly without those unpleasant years (the “Alexander Solzhenitsyn Effect”). Finally, embedding moderately intense years in the middle of life did not produce effects as strong as adding those years to the end of life, suggesting that a life's ending is weighted especially heavily in judging quality of life.
Not All Laughs are Alike: Voiced but Not Unvoiced Laughter Readily Elicits Positive Affect
Authors: Bachorowski Jo-Anne , Owren Michael J.
Published: March 2003

We tested whether listeners are differentially responsive to the presence or absence of voicing, a salient, distinguishing acoustic feature, in laughter. Each of 128 participants rated 50 voiced and 20 unvoiced laughs twice according to one of five different rating strategies. Results were highly consistent regardless of whether participants rated their own emotional responses, likely responses of other people, or one of three perceived attributes concerning the laughers, thus indicating that participants were experiencing similarly differentiated affective responses in all these cases. Specifically, voiced, songlike laughs were significantly more likely to elicit positive responses than were variants such as unvoiced grunts, pants, and snortlike sounds. Participants were also highly consistent in their relative dislike of these other sounds, especially those produced by females. Based on these results, we argue that laughers use the acoustic features of their vocalizations to shape listener affect.
Parents Explain More Often to Boys Than to Girls During Shared Scientific Thinking
Authors: Crowley Kevin , Callanan Maureen A. , Tenenbaum Harriet R. , Allen Elizabeth
Published: March 2003

Young children's everyday scientific thinking often occurs in the context of parent-child interactions. In a study of naturally occurring family conversation, parents were three times more likely to explain science to boys than to girls while using interactive science exhibits in a museum. This difference in explanation occurred despite the fact that parents were equally likely to talk to their male and female children about how to use the exhibits and about the evidence generated by the exhibits. The findings suggest that parents engaged in informal science activities with their children may be unintentionally contributing to a gender gap in children's scientific literacy well before children encounter formal science instruction in grade school.
Putting Adjustment Back in the Anchoring and Adjustment Heuristic: Differential Processing of Self-Generated and Experimenter-Provided Anchors
Authors: Epley Nicholas , Gilovich Thomas
Published: March 2003

People's estimates of uncertain quantities are commonly influenced by irrelevant values. These anchoring effects were originally explained as insufficient adjustment away from an initial anchor value. The existing literature provides little support for the postulated process of adjustment, however, and a consensus that none takes place seems to be emerging. We argue that this conclusion is premature, and we present evidence that insufficient adjustment produces anchoring effects when the anchors are self-generated. In Study 1, participants' verbal reports made reference to adjustment only from self-generated anchors. In Studies 2 and 3, participants induced to accept values by nodding their heads gave answers that were closer to an anchor (i.e., they adjusted less) than participants induced to deny values by shaking their heads—again, only when the anchor was self-generated. These results suggest it is time to reintroduce anchoring and adjustment as an explanation for some judgments under uncertainty.
Perspective Based on Stereopsis and Occlusion
Authors: Gillam Barbara J. , Cook Michael L.
Published: March 2003

Perspective is usually considered a monocular pictorial cue, distinct from other cues such as occlusion and stereopsis. We cut across these distinctions by asking whether purely binocular (cyclopean) contours, created by stereoscopically shifting a region of homogeneous texture nearer or further than its surround, can act as a linear-perspective cue and whether the contours' ability to do this is influenced by their surface belongingness. We found that the left/right orientation of cyclopean trapezoids nearer than a surround strongly influenced perceived slant, showing that perspective constraints are applied to stereoscopically derived contours. Further regions, however, appeared as surfaces seen through a trapezoidal aperture. Because the aperture “owned” the trapezoidal contours, their orientation had little effect on perceived slant. We conclude that the application of perspective constraints depends critically on how contours are classified by stereo-specified occlusion relationships among surfaces and that perspective, stereopsis, and occlusion are not distinct processing systems.
Absolute Pitch and Tempo in Mothers' Songs to Infants
Authors: Bergeson Tonya R. , Trehub Sandra E.
Published: March 2003

We examined the relative stability of pitch, tempo, and rhythm in maternal speech and singing to prelinguistic infants. Mothers were recorded speaking and singing to their infants on two occasions separated by 1 week or more. The pitch level and tempo of identical utterances were highly variable across the 1-week period, but these features were virtually unchanged in song repetitions. Rhythmic patterning was largely maintained in speech, as in song. Mothers' accurate reproduction of their sung performances can be considered a form of absolute pitch and absolute tempo.
The Affective Consequences of Expected and Unexpected Outcomes
Authors: Shepperd James A. , McNulty James K.
Published: March 2003

How do people feel about unexpected positive and negative outcomes? Decision affect theory (DAT) proposes that people feel displeasure when their outcomes fall short of the counterfactual alternative and elated when their outcomes exceed the counterfactual alternative. Because disconfirmed expectations provide a counterfactual alternative, DAT predicts that bad outcomes feel worse when unexpected than when expected, yet good outcomes feel better when unexpected than when expected. Consistency theories propose that people experience displeasure when their expectations are disconfirmed because the disconfirmation suggests an inability to predict. According to consistency theories, both good and bad outcomes feel worse when unexpected than when expected. These two theoretical approaches were tested in three studies. The results consistently support DAT.
Constrained Formation of Object Representations
Authors: O'Connor Kevin J. , Potter Mary C.
Published: March 2003

Viewers were presented with a rapid sequence of very brief stimulus pairs, each of which consisted of a pictured object followed by a related or unrelated word. The form of relatedness between the picture and word was manipulated across experiments (identical concept, associated concept, ink color of the picture). Recognition memory for the pictures was affected not only by whether or not paired items were conceptually identical or semantically related, but also by whether or not the words named an irrelevant feature, ink color. These results show that sequential items are integrated on the basis of similarity at whatever level is available, so that the stability of the memory representation of one or both items is increased. We propose that a common mechanism may underlie integration, priming, and selective attention.
Ecstasy and Agony: Activation of the Human Amygdala in Positive and Negative Emotion
Authors: Hamann Stephan B. , Ely Timothy D. , Hoffman John M. , Kilts Clinton D.
Published: March 2003

Considerable evidence indicates that the amygdala plays a critical role in negative, aversive human emotions. Although researchers have speculated that the amygdala plays a role in positive emotion, little relevant evidence exists. We examined the neural correlates of positive and negative emotion using positron emission tomography (PET), focusing on the amygdala. Participants viewed positive and negative photographs, as well as interesting and uninteresting neutral photographs, during PET scanning. The left amygdala and ventromedial prefrontal cortex were activated during positive emotion, and bilateral amygdala activation occurred during negative emotion. High-interest, unusual photographs also elicited left-amygdala activation, a finding consistent with suggestions that the amygdala is involved in vigilance reactions to associatively ambiguous stimuli. The current results constitute the first neuroimaging evidence for a role of the amygdala in positive emotional reactions elicited by visual stimuli. Although the amygdala appears to play a more extensive role in negative emotion, it is involved in positive emotion as well.
Lightness Constancy: A Direct Test of the Illumination-Estimation Hypothesis
Authors: Rutherford M.D. , Brainard D.H.
Published: March 2003

Many models of color constancy assume that the visual system estimates the scene illuminant and uses this estimate to determine an object's color appearance. A version of this illumination-estimation hypothesis, in which the illuminant estimate is associated with the explicitly perceived illuminant, was tested. Observers made appearance matches between two experimental chambers. Observers adjusted the illumination in one chamber to match that in the other and then adjusted a test patch in one chamber to match the surface lightness of a patch in the other. The illumination-estimation hypothesis, as formulated here, predicted that after both matches the luminances of the light reflected from the test patches would be identical. The data contradict this prediction. A second experiment showed that manipulating the immediate surround of a test patch can affect perceived lightness without affecting perceived illumination. This finding also falsifies the illumination-estimation hypothesis.
Evolved Sex Differences in the Number of Partners Desired? The Long and the Short of It
Authors: Pedersen William C. , Miller Lynn Carol , Putcha-Bhagavatula Anila D. , Yang Yijing
Published: March 2003

Do men seek more short-term mates than women? Buss and Schmitt (1993) showed a pattern of mean difference in the ideal number of sexual partners men and women desired over various time frames. We replicated these mean sex differences (e.g., ideal number over the next 30 years: Ms = 7.69 and 2.78 for men and women, respectively), but in both data sets the sampling distributions were highly skewed. In Study 1, we found few sex differences in medians across time frames (e.g., ideal number over the next 30 years: Mdn = 1 for both men and women). In Study 2, most college men (98.9%) and women (99.2%) said they wanted to settle down with one mutually exclusive sexual partner at some point in their life, ideally within the next 5 years. Neither medians in number of partners desired overall before settling down (replicating Study 1) nor medians in short-term partners desired before settling down (Mdn = 0) differed significantly by gender. Rather, men and women concurred: Short-term mating is not what humans typically seek.
Infants and Toddlers Discriminate Amount: Are They Measuring?
Authors: Huttenlocher Janellen , Duffy Sean , Levine Susan
Published: March 2003

Four experiments that show an early ability to encode and retain information about extent are presented. We found that infants discriminate between the heights of dowels in a habituation task. We also found that toddlers discriminate between heights on a choice task in which a target dowel is presented and removed and they then choose between the target and a foil. Until 4 years of age, however, discrimination occurs only in the presence of a perceptually salient standard. Adults do not require a perceptually present standard; they can assess extent across temporal or spatial gaps by imposing a standard (measure). The present findings indicate that infants and toddlers do not possess an adult ability to establish extent, but that they do possess a skill that provides a start point for this important intellectual achievement.
Cuing Interacts with Perceptual Load in Visual Search
Authors: Johnson Douglas N. , McGrath Allison , McNeil Carrie
Published: March 2003

We tested the strong form of the perceptual-load hypothesis, which posits that the amount of perceptual load is the only factor determining whether attention can be effectively focused. Participants performed a visual search task under conditions of low and high load and with either a 100% valid spatial cue or no spatial cue. With no cue, participants showed evidence of processing to-be-ignored stimuli when perceptual load was low but not when it was high, consistent with the perceptual-load hypothesis. However, with a 100% valid spatial cue, participants showed little evidence of processing to-be-ignored stimuli, even when perceptual load was low. These results suggest that although perceptual load may be an important factor in attentional selectivity, load alone is not sufficient to explain how and when selective attention is effective.
Development of Form Similarity as a Gestalt Grouping Principle in Infancy
Authors: Quinn Paul C. , Bhatt Ramesh S. , Brush Diana , Grimes Autumn , Sharpnack Heather
Published: March 2003

Given evidence demonstrating that infants 3 months of age and younger can utilize the Gestalt principle of lightness similarity to group visually presented elements into organized percepts, four experiments using the familiarization/novelty-preference procedure were conducted to determine whether infants can also organize visual pattern information in accord with the Gestalt principle of form similarity. In Experiments 1 and 2, 6- to 7-month-olds, but not 3- to 4-month-olds, presented with generalization and discrimination tasks involving arrays of X and O elements responded as if they organized the elements into columns or rows based on form similarity. Experiments 3 and 4 demonstrated that the failure of the young infants to use form similarity was not due to insufficient processing time or the inability to discriminate between the individual X and O elements. The results suggest that different Gestalt principles may become functional over different time courses of development, and that not all principles are automatically deployed in the manner originally proposed by Gestalt theorists.
Semantic Generation Can Cause Episodic Forgetting
Authors: Bäuml Karl-Heinz
Published: March 2003

The repeated retrieval of a subset of previously learned items can cause forgetting of the nonretrieved items. The study reported here investigated whether retrieval-induced forgetting generalizes to a situation in which the retrieved and nonretrieved items are not part of the same experiential episode and task. Subjects learned an item list that they had to recall later in the experiment. In a separate intermediate phase, they repeatedly generated related items from semantic memory, or were presented the same items intact for study. Only the semantic generation of items, and not their presentation for study, induced forgetting of the initially learned items. This result indicates that, first, semantic generation can cause recall-specific episodic forgetting and, second, retrieval-induced forgetting can occur even if the retrieved and nonretrieved items belong to different experiential episodes and tasks. Connections of the present results to other memory phenomena, such as part-set cuing and the generation effect, social cognition, and eyewitness memory, are discussed.