bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Context of Uncertainty Modulates the Subcortical Response to Predictability
Authors: Bischoff-Grethe Amanda , Martin Megan , Mao Hui , Berns Gregory S. 
Published: July 2002

Abstract
Implicit motor learning tasks typically involve comparisons of subject responses during a sequence versus a random condition. In neuroimaging, brain regions that are correlated with a sequence are described, but the temporal relationship of sequence versus nonsequence conditions is often not explored. We present a functional magnetic resonance imaging (fMRI) study describing activation related to sequential predictability in an implicit sensorimotor learning task and the history (context) dependence of these effects. Participants regarded four squares displayed horizontally across a screen and pressed a button when any one of the four targets was illuminated in a particular color. A repeating spatial sequence with varying levels of predictability was embedded within a random color presentation. Both the right dorsolateral prefrontal cortex (R DLPFC) and right caudate displayed a positive correlation to increasing predictability, whereas the left posterior parietal cortex (L PPC) displayed a negative correlation. However, the activation changes within the caudate were significant when transitioning from high predictability to low predictability but not for the reverse case, suggesting a sensitivity not only to predictability but to order effects as well. These results support the hypothesized relationship between basal ganglia and visuomotor sequential learning, but demonstrate the importance of context upon sequence learning.
How Does the Brain Discriminate Familiar and Unfamiliar Faces?: A PET Study of Face Categorical Perception
Authors: Rossion Bruno , Schiltz Christine , Robaye Laurence , Pirenne David , Crommelinck Marc 
Published: July 2002

Abstract
Where and how does the brain discriminate familiar and unfamiliar faces? This question has not been answered yet by neuroimaging studies partly because different tasks were performed on familiar and unfamiliar faces, or because familiar faces were associated with semantic and lexical information. Here eight subjects were trained during 3 days with a set of 30 faces. The familiarized faces were morphed with unfamiliar faces. Presented with continua of unfamiliar and familiar faces in a pilot experiment, a group of eight subjects presented a categorical perception of face familiarity: there was a sharp boundary in percentage of familiarity decisions between 40% and 60% faces. In the main experiment, subjects were scanned (PET) on the fourth day (after 3 days of training) in six conditions, all requiring a sex classification task. Completely novel faces (0%) were presented in Condition 1 and familiar faces (100%) in Condition 6, while faces of steps of 20% in the continuum of familiarity were presented in Conditions 2 to 5 (20% to 80%). A principal component analysis (PCA) indicated that most variations in neural responses were related to the dissociation between faces perceived as familiar (60% to 100%) and faces perceived as unfamiliar (0 to 40%). Subtraction analyses did not disclose any increase of activation for faces perceived as familiar while there were large relative increases for faces perceived as unfamiliar in several regions of the right occipito-temporal visual pathway. These changes were all categorical and were observed mainly in the right middle occipital gyrus, the right posterior fusiform gyrus, and the right inferotemporal cortex. These results show that (1) the discrimination between familiar and unfamiliar faces is related to relative increases in the right ventral pathway to unfamiliar/novel faces; (2) familiar and unfamiliar faces are discriminated in an all-or-none fashion rather than proportionally to their resemblance to stored representations; and (3) categorical perception of faces is associated with abrupt changes of brain activity in the regions that discriminate the two extremes of the multidimensional continuum.
Split-Second Sequential Selective Activation in Human Secondary Visual Cortex
Authors: Kenemans J. Leon , Lijffijt Marijn , Camfferman Gert , Verbaten Marinus N. 
Published: July 2002

Abstract
This work addressed early selection based on nonspatial visual features, using event-related potentials (ERPs) with high temporal resolution and dipole-source modeling. Subjects were presented rapid sequences of gratings varying in spatial frequency and orientation, and were instructed to attend to gratings with one spatial frequency and ignore those with another. Attention effects started at 120-msec latency as anterior positivity and proceeded as posterior negativity (200 msec) and anterior negativity (265 msec). Dipole-source modeling suggested that these effects reflect the sequential selective activation of, on average, posterior dorsal–medial, posterior ventral–lateral, and anterior medial cortical areas. In contrast, stimulus-specific activity was observed well before 100-msec latency and characterized by dipoles with locations significantly posterior to those of the attention-modulated activity. These results indicate that even with highly discriminable spatial frequencies, selection is not as early as before the 100-msec latency, unlike what is often found for location selection. It is also separated in time and anatomically from the earliest stimulus-specific cortical activity. Reducing discriminability of the selection feature resulted in longer selection latencies, becoming manifest only at 175 msec as an apparent combination of posterior and anterior negativities, and in an elevated criterion for overt responding.
Impact of fMRI Acoustic Noise on the Functional Anatomy of Visual Mental Imagery
Authors: Mazard A. , Mazoyer B. , Etard O. , Tzourio-Mazoyer N. , Kosslyn S.M. , Mellet E. 
Published: July 2002

Abstract
One drawback of functional magnetic resonance imaging (fMRI) is that the subject must endure intense noise during testing. We examined the possible role of such noise on the activation of early visual cortex during visual mental imagery. We postulated that noise may require subjects to work harder to pay attention to the task, which in turn could alter the activation pattern found in a silent environment. To test this hypothesis, we used positron emission tomography (PET) to monitor regional Cerebral Blood Flow (rCBF) of six subjects while they performed an imagery task either in a silent environment or in an “fMRI-like” noisy environment. Both noisy and silent imagery conditions, as compared to their respective baselines, resulted in activation of a bilateral frontoparietal network (related to spatial processing), a bilateral inferior temporal area (related to shape processing), and deactivation of anterior calcarine cortex. Among the visual areas, rCBF increased in the most posterior part of the calcarine cortex, but at level just below the statistical threshold. However, blood flow values in the calcarine cortex during the silent imagery condition (but not the noisy imagery condition) were strongly negatively correlated with accuracy; the more challenging subjects found the task, the more strongly the calcarine cortex was activated. The subjects made more errors in the noisy condition than in the silent condition, and a direct comparison of the two conditions revealed that noise resulted in an increase in rCBF in the anterior cingulate cortex (involved in performance monitoring) and in the Wernicke's area (required to encode the verbal cues used in the task). These results thus demonstrate a nonadditive effect of fMRI gradient noise, resulting in a slight but significant effect on both performance and the neural activation pattern.
Neural Systems for Visual Orienting and Their Relationships to Spatial Working Memory
Authors: Corbetta Maurizio , Kincade J. Michelle , Shulman Gordon L. 
Published: July 2002

Abstract
We investigated neural correlates of human visual orienting using event-related functional magnetic resonance imaging (fMRI). When subjects voluntarily directed attention to a peripheral location, we recorded robust and sustained signals uniquely from the intraparietal sulcus (IPs) and superior frontal cortex (near the frontal eye field, FEF). In the ventral IPs and FEF only, the blood oxygen level dependent signal was modulated by the direction of attention. The IPs and FEF also maintained the most sustained level of activation during a 7-sec delay, when subjects maintained attention at the peripheral cued location (working memory). Therefore, the IPs and FEF form a dorsal network that controls the endogenous allocation and maintenance of visuospatial attention. A separate right hemisphere network was activated by the detection of targets at unattended locations. Activation was largely independent of the target's location (visual field). This network included among other regions the right temporo-parietal junction and the inferior frontal gyrus. We propose that this cortical network is important for reorienting to sensory events.
Do Deaf People See Better? Texture Segmentation and Visual Search Compensate in Adult but Not in Juvenile Subjects
Authors: Rettenbach Regina , Diller Gottfried , Sireteanu Ruxandra 
Published: July 2002

AbstractThe research concerning the visual perception in deaf subjects has led to contradictory results: Deaf subjects have been reported to show enhanced visual perceptual skills compared to hearing subjects (Neville & Lawson, 1987). On the other hand, there are indications that acoustic deprivation may produce an inferiority in all sensory modalities (Myklebust, 1964). These contradictions may be due to methodological differences: The investigators selected different conditions (e.g. attentive/nonattentive) and various samples of deaf subjects (e.g., different age, language, and aetiology groups).In our study, we tested a large sample of deaf subjects with texture segmentation and visual search conditions, which allowed us to differentiate between visual processing with and without attentional load. All deaf subjects had profound hearing loss within the first year of life. Our results suggest that the visual processing capacity of deaf children and adolescents does not exceed that of age- and gender-matched hearing subjects. Rather, deaf school children show deficits in visual processing in conditions with and without attentional load. Age (6 to 20 years), language used (oral, sign, oral + sign), and aetiology for deafness (genetic, maternal rubella, perinatal, infection in the first year of life, unknown) did not consistently influence the results.The deficits in visual processing were partially compensated for in adult deaf subjects. The performances of deaf and hearing adults in trials that could be solved preattentively did not differ statistically significantly, but in attention-dependent trials the deaf subjects were more efficient than the hearing controls.We conclude that visual compensation for deafness is limited to attention-dependent tasks and does not develop until adulthood.
Weighting in Practice:Implications for the Use of Life‐Cycle Assessment in Decision Making
Authors: Bengtsson Magnus 
Published: July 2002

SummaryThis article investigates how environmental trade‐offs are handled in life‐cycle assessment (LCA) studies in some Nordic companies. Through interviews, the use and understanding of weighting methods in decision making was studied. The analysis shows that the decision makers require methods with which to aggregate and help interpret the complex information from life‐cycle inventories. They agreed that it was not their own values that should be reflected in such methods, but they were found to have different opinions concerning the value basis that should be used. The analysis also investigates the difficulties arising from using such methods. The decision makers seemed to give a broader meaning to the term weighting, and were more concerned with the comparison between environmental and other aspects than the weighting of different environmental impacts. A conclusion is that decision makers need to be more involved in modeling and interpretation. The role of the analyst should be to interpret the information needs of the decision maker, and help him or her make methodological choices that are consistent with these needs and relevant from his or her point of view. To achieve this, it is important that decision makers do not view LCA as a highly standardized calculation tool, but as a flexible process of collecting, organizing, and interpreting environmental information. Such an approach to LCA increases the chances that the results will be regarded as relevant and useful.
Indonesian Movements for the Creation of a 'National Madhhab'
Authors: Feener R. Michael 
Published: July 2002

AbstractDuring the middle decades of the twentieth century, Indonesian Muslim scholars participated in a movement for the creation of a new "national madhhab." These unprecedented developments took place within contexts of modernity in which the epistemological structures of traditional Islamic jurisprudence, as known and practiced in Indonesia, were faced with challenges by both "Western" and Islamic reformist thought. This essay presents an overview of these developments that highlights their significance for comparative studies of modern Muslim jurisprudence, with particular reference to the works of Hasbi Ash Shiddieqy and Hazairin.
IN DEFENSE OF THE COMPARATIVE METHOD
Authors: Segal Robert 
Published: July 2002

AbstractWhile in some disciplines the comparative method is used unhesitatingly, in others it is spurned. In the field of religious studies, the method has long been rejected, and that rejection far antedates the anti-comparativist stance of postmodernism. This article identifies the main objections commonly lodged against the method and attempts to refute them all - as mischaracterizations either of the method or of the quest for knowledge itself. The article then considers the use of the method by the two figures in religious studies still singled out as the most egregious practitioners of it: James Frazer and William Robertson Smith. In actuality, not even they turn out to be guilty of any of the objections lodged against the method. At the same time they turn out to employ the method in contrary ways. Frazer uses the method to show the similarities among religions; Smith uses it as much to show the differences. The contrasting use of the same method by its most famous practitioners shows that the method is not merely malleable but indispensable to all scholars of religion - those seeking the particularities of individual religions no less than those seeking the universals of religion.
Every Sparrow That Falls: Understanding Animal Rights Activism as Functional Religion
Authors: Jamison Wesley , Parker James , Wenk Caspar 
Published: July 2002

AbstractThis article reports original research conducted among animal rights activists and elites in Switzerland and the United States, and the finding that activism functioned in activists' and elites' lives like religious belief. The study used reference sampling to select Swiss and American informants. Various articles and activists have identified both latent and manifest quasi-religious components in the contemporary movement. Hence, the research followed upon these data and anecdotes and tested the role of activism in adherents' lives. Using extensive interviews, the research discovered that activists and elites conform to the five necessary components of Yinger's definition of functional religion: intense and memorable conversion experiences, newfound communities of meaning, normative creeds, elaborate and well-defined codes of behavior, and cult formation. The article elaborates on that schema in the context of animal rights belief, elucidates the deeply meaningful role of activism within a filigree of meaning, and concludes that the movement is facing schismatic forces not dissimilar to redemptive and religious movements
NO SEXUAL IMPRINTING ON A RED BILL AS A NOVEL TRAIT
Authors: Hörster Anne , Curio Eberhard , Witte Klaudia 
Published: July 2002

Abstract
Sexual imprinting is one of several known non - genetical, yet social factors which influence mate preferences and might play a role in the evolution of novel traits. We introduced a red bill as a novel trait in a monomorphic estrildid finch, the Javanese mannikin Lonchura leucogastroides. We established three different imprinting groups in which the father only, the mother only or none of the parents had a red bill. After reaching maturity we tested the offspring in double choice tests for a response to birds of the opposite sex with a naturally coloured black bill or with an artificially coloured red bill. Neither males nor females showed a preference for potential mates with a red bill. Males and females raised by a red bill father showed even a strong rejection to conspecifics of the opposite sex with a red bill. This is in contrast to a previous imprinting study in the Javanese mannikin under similar conditions (Witte et al., 2000) in which males and females became sexually imprinted on conspecifics adorned with a red feather on the forehead. It seems that not all kinds of novel traits birds can be sexually imprinted on. We could show in the present study that the red bill is a meaningful trait in female mate choice, i.e. females responded to males with and without a red bill in a similar way as do females imprinted on natural type parents to males with and without other artificial adornments (Witte & Curio, 1999). We could confirm an interaction between the red bill and the natural attractiveness of males as found in a previous study (Witte & Curio, 1999). Our study opens up questions about what traits are really learned and why some traits are not learned during imprinting.
FOREBRAIN SIZE AND INNOVATION RATE IN EUROPEAN BIRDS: FEEDING, NESTING AND CONFOUNDING VARIABLES
Authors: Nicolakakis Nektaria , Lefebvre Louis 
Published: July 2002

Abstract
Previous work has shown a positive correlation between relative forebrain size and feeding innovation frequency, corrected for species number, over different taxonomic groups of birds. Several confounding variables could account for this relationship: ornithologists could notice and report innovations more often in certain taxa because of biased expectations, greater research effort, editorial bias in journals or large population sizes of the taxa. The innovationforebrain correlation could also be spuriously caused by phylogeny or juvenile development mode. We examined these possibilities by entering species number per taxon, population size, number of full length papers, expectations (assessed by a questionnaire), journal source and development mode in multiple regressions that also included relative forebrain size. We did this with and without phylogenetic corrections and tested two behavioural categories, feeding and nesting, where flexibility and learning are clearly thought to differ, but confounds should have similar effects. Through an exhaustive survey covering 30 years in 11 journals, a total of 683 innovations was gathered for the northwestern part of Europe, 507 for feeding and 176 for nesting. Species number per taxon was the only significant confound for both feeding and nesting reports; as predicted, forebrain size was a second significant predictor for feeding innovations, but not for nesting. The frequency of feeding innovations in the short notes of ornithology journals thus appears to be a valid and reliable way to operationalise behavioural flexibility in birds.
INDIVIDUAL AND STATUS RECOGNITION IN THE CRAYFISH, ORCONECTES RUSTICUS: THE EFFECTS OF URINE RELEASE ON FIGHT DYNAMICS
Authors: Schneider Rebecca A. Zulandt , Huber Robert , Moore Paul 
Published: July 2002

Abstract
This study examined individual and status recognition in dyadic interactions between crayfish and determines how blocking the release of urine, a known source of chemical cues, may influence recognition. Behavioral characteristics of agonistic interactions were compared between crayfish pairs that fought each other previously (familiar) and pairs derived from individuals with past status history but no previous experience with one another (unfamiliar). To address the role of urine born chemical cues in recognition, fight dynamics were examined in urine blocked and non-blocked familiar and unfamiliar pairs. Our results indicate the existence of status recognition in crayfish as first fights were longer than second fights and the statistical interaction between fight number and familiar/unfamiliar treatment was similar. Urine cues play a role in social recognition in that fights are longer and more intense when urine cues are absent than when urine cues are present. Communication of behavioral state through urine appears to play an important role in the agonistic interactions of crayfish.
PATTERNS OF INBREEDING AVOIDANCE IN TEMMINCK'S RED COLOBUS
Authors: Starin E.D. 
Published: July 2002

AbstractAmongst Temminck's red colobus living in the Abuko Nature Reserve, The Gambia, the mechanism for avoiding close inbreeding may depend on the form of inbreeding. Mother-son inbreeding may be avoided through learned behaviour and possibly secondary transfer by the mother. Father-daughter inbreeding may be limited due to transfer and demographic patterns but also aggression directed at the male from the mountee's mother. Maternal brother-sister inbreeding may be avoided through female transfer patterns. Presummed paternal brothersister inbreeding is infrequent but does occur and is not discouraged or avoided.
MATE CHOICE COPYING IN GUPPIES: FEMALES AVOID THE PLACE WHERE THEY SAW COURTSHIP
Authors: Brooks Robert 
Published: July 2002

AbstractRecent evidence shows that females of many species may copy the mate choice of other females, potentially resulting in the cultural inheritance of mating preferences. The best evidence of mate choice copying has been obtained from studies on guppies, but studies on some guppy populations have failed to find evidence of copying. I report on an experiment in which I found no evidence of mate choice copying in a feral Australian population, either in a traditional 'dichotomous choice tank' design or when females had an opportunity to swim and interact freely with the males. Instead, I found that females tended to avoid the side of the tank on which they had seen a male courting a female. This may not be a mate choice strategy, but possibly a predator avoidance or foraging strategy.