bluuebunny/crossref_metadata_2025 huggingface dataset:
Collapsible circular sections of quadric surfaces
Authors: Turnbull H. W.
Published: October 2008

Cardboard or wire models of ellipsoids and hyperboloids exist which consist of two sets of circular sections. They cover the quadric surface with curvilinear quadrilaterals, whose sides remain constant in length when the model alters in shape. In fact the models admit of one degree of freedom—they are collapsible—and the angle between the two sets of circular sections can be varied.
On certain modular determinants
Authors: Turnbull H. W.
Published: October 2008

An interesting determinant occurs in the fifth volume of Muir's History1. It is

where n = ½ (p – 1), and ars is the smallest positive integer such that

rars = s (mod p), (1) p being any odd prime number. It is evident that each element ars is unique and non zero. For p = 5, 7, 11 the determinants are

(2) respectively, and their values are

– 5 , 72, 114.
A note on the “probleme des rencontres.”
Authors: Aitken A. C.
Published: October 2008

1. This celebrated problem is treated in nearly all the textbooks on probability; for example in Bertrand's Calcul des Probabilités, 1889, pp. 15–17, in Poincare's of the same title, 1896, pp. 36–38, and in most of the recent textbooks. The problem may be stated in abstract terms as follows: Among the n! permutations (α1α2α3… αn) of the natural order (123…n), how many have no αi equal to j? The problem has been clothed in many picturesque (and highly unlikely) “representations”; for example, by imagining n letters placed at random in n addressed envelopes, and inquiring what is the chance that no letter is in its correct envelope; or by imagining n gentlemen returning at random to their n houses; and so on, ad risum. Various derivations have also been given of the probability in question, namely the first n + 1 terms of the expansion of e-1, to which function the probability converges with rapidity as n increases.
On the evaluation of Planck's integral
Authors: Goodstein R. L.
Published: October 2008

The object of this note is to outline a rigorous evaluation of Planck's integral by methods which presuppose no more than an elementary knowledge of the Calculus. The proof has been divided into four theorems each of which is of some interest in itself.
On an approximate construction for a regular polygon
Authors: Scott S. A.
Published: October 2008

My attention was drawn by an Art teacher to the following approximate construction for inscribing a regular polygon of n sides in a given circle, having diameter AB, centre O. Find C in AB so that AC: AB = 2: n, and construct the equilateral triangle ABD. If DC produced meets the circle in E, then AE is approximately a side of the required polygon.
A Generalisation of Dirichlct's Multiple Integral
Authors: Good I. J.
Published: October 2008

The purpose of this note is to generalise the Dirichlet-Liouville formula which expresses a certain type of multiple integral in terms of a single integral. In our formula the multiple integral will involve several arbitrary functions instead of only one, and it will be expressed as a product of single integrals.
On the sum of the r-th powers of the first n integers
Authors: Waterson A.
Published: October 2008

In this note an explicit expression is obtained for the sum of the r-th powers of the first n integers. The result is equivalent to the well-known result in terms of Bernoulli numbers and the equivalence is not difficult to establish. However, the method given here is elementary and self-contained and provides an excellent exercise on. the manipulation of determinants.
Conjectures as to a factor of 2P ± 1
Authors: Wilson Neil Y.
Published: October 2008

More than 300 years ago Mersenne made pronouncements as to the prime or composite nature of 2P – 1 for all prime values of p from 1 to 257. His reasons were not disclosed, but the combined efforts of many mathematicians have shown that his statements were substantially correct. Of course when p is composite, two or more factors of 2p ± 1 will often be obvious but, as far as I am aware, only two general theorems relating to a non-obvious factor have been proved. I give these by way of introduction to this article and thereafter proceed to enunciate seven new and original theorems. As I offer no theoretical proofs of the theorems, they must be regarded as conjectures. They are, however, based on extensive computation which has engaged me for a period of three years.
The Definition of a Tangent to a Curve
Authors: Flett T. M.
Published: October 2008

1. In elementary geometry, the tangent to a curve C at a point P is defined as the limiting position of the chord PQ as Q tends to P along the curve. Further, C is said to have a continuous tangent at P if it has a tangent at every point Q in the neighbourhood of P, and if the tangent at Q tends to the tangent at P as Q tends to P along C.1
Normal development of pattern motion sensitivity in macaque monkeys
Authors: HALL-HARO CYNTHIA , KIORPES LYNNE
Published: October 2008

We studied the development of sensitivity to complex motion using plaid patterns. We hypothesized, based on neurophysiological data showing a dearth of pattern direction–selective (PDS) cells in area medial temporal (MT) of infant macaques, that sensitivity to pattern motion would develop later than other forms of global motion sensitivity. We tested 10 macaque monkeys (Macaca nemestrina) ranging in age from 7 weeks to 109–160 weeks (adult). The monkeys discriminated horizontal from vertical pattern motion; sensitivity for one-dimensional (1D) direction discrimination and detection were tested as control tasks. The results show that pattern motion discrimination ability develops relatively late, between 10 and 18 weeks, while performance on the 1D control tasks was excellent at the earliest test ages. Plaid discrimination performance depends on both the speed and spatial scale of the underlying patterns. However, development is not limited by contrast sensitivity. These results support the idea that pattern motion perception depends on a different mechanism than other forms of global motion perception and are consistent with the idea that the representation of PDS neurons in MT may limit the development of complex motion perception.
Mother-child interactional correlates of maltreated and nonmaltreated children's play behavior
Authors: Alessandri Steven M.
Published: October 2008

This study investigates maternal interactive styles and their relation to children's play and nonplay behaviors. Fifteen maltreated and 15 nonmaltreated preschool-aged children and their mothers were observed during a laboratory play session and during problem-solving situations. Children's play behaviors were later videotaped in the classroom and analyzed for the level of social participation and cognitive complexity. Results indicated that maltreated mothers were less involved with their children, used fewer physical and verbal strategies to direct their children's attention, and were more negative compared with nonmaltreated mothers. Higher levels of cognitive play were positively related to both maternal physical and verbal attention-directing behaviors, high maternal involvement, and positive affective tone. The role of maternal stimulation in children's play development and implications for intervention programs are discussed.
Psychopathology in boys with Tourette syndrome: Effects of age on the relationship between psychological and physical symptoms
Authors: Koenig Linda J. , Bornstein Robert A.
Published: October 2008

Tourette syndrome (TS), a neuropsychiatric disorder that presents in childhood and is characterized by recurrent tics, is often associated with a variety of psychological problems. Most studies of concomitant problems have focused on psychiatric comorbidity, with less attention paid to nonsyndrome-specific or subsyndromal emotional and behavioral difficulties. Moreover, little is known about the factors that influence the specificity or severity of psychological problems. We hypothesized that level and type of psychological problem would be influenced by both severity of illness and developmental period. Children with severe tics were predicted to show increased levels of externalizing (undercontrolled) behavior, whereas adolescents with severe tics were predicted to show increased levels of internalizing (overcontrolled) behavior. Forty-one boys with TS were rated by their parents for tic severity (simple and complex motor tics) and psychological symptoms (Connors Parent Symptom Questionnaire and the Child Behavior Checklist). Results partially confirmed the hypothesis, indicating that greater illness severity was associated with greater psychological disturbance, but only in the younger subjects. Among the adolescents, even those with mild tics demonstrated relatively high levels of psychological symptoms. However, there was no indication that developmental period was related to the specific type of problem manifested. Regardless of age, patients with severe tics domonstrated high levels of externalizing behavior, and relatively high levels of internalizing behavior were also seen. Results are discussed in terms of the developmental factors that might influence the relationship between psychological and physical symptoms in children with TS.
Retrospective and concurrent self-report of behavioral inhibition and their relation to adult mental health
Authors: Reznick J. Steven , Hegeman Irene M. , Kaufman Emily R. , Woods Scott W. , Jacobs Marlene
Published: October 2008

Four studies are reported in which an interview or questionnaire is used to measure the relation between behavioral inhibition, defined as consistent restraint in response to unfamiliar social or nonsocial stimuli, and adult mental health. In Study 1, undergraduates were tested using a retrospective self-report questionnaire. Those who reported more behaviors suggesting childhood inhibition also reported more mental health problems. Study 2 was an attempt to establish the postdictive validity of the measurement of childhood inhibition. College students and their parents completed the questionnaire independently and were in extremely strong agreement regarding the student's inhibited behaviors as a child. In Study 3, self-reported contemporary behaviors suggesting inhibition correlated with the retrospective self-report of inhibition. Both measures correlated with the State Anxiety Subscale of the State-Trait Anxiety Inventory and the Center for Epidemiologic Studies Depression Scale, and both accounted for unique variance in anxiety, but only contemporary inhibition accounted for unique variance in depression. In Study 4, adults who had been treated for panic disorder or depression were interviewed and reported more behaviors indicative of inhibition during childhood than did control subjects. These four studies support the usefulness of retrospective self-report as a measure of childhood inhibition and are compatible with the hypothesis that a tendency toward inhibited behavior in childhood or adulthood may be a risk factor for mental health problems.
Stability of behavior problems in very young children
Authors: Rose Susan L. , Rose Susan A. , Feldman Judith F.
Published: October 2008

This study examined the stability of behavior problems in 44 low SES children ages 2–5 years using the preschool and standard versions of Achenbach's Child Behavior Checklist. While scores for the present sample did not differ significantly from Achenbach's standardization sample at age 2, scores at ages 4 and 5 were somewhat elevated; this was true for the Total score, as well as for the two broad-band scores (Internalizing and Externalizing). At all ages, the Internalizing and Externalizing scores correlated highly with one another (r= .58 to .74). Stability coefficients across one to three year intervals revealed significant continuity for the Total and Externalizing scores (r= .42 to .73). Internalizing scores were stable only between ages 4 and 5 (r= .53). In addition, early Externalizing scores also predicted subsequent Internalizing scores, suggesting that early Externalizing symptomatology has diverse implications. Maternal depression and negative life events, assessed at ages 4 and 5, correlated strongly with child behavior scores at both these ages. However, neither factor accounted for the stability in childrens' symptomatology. Overall, the levels of stability found here were comparable to those reported for older children. The results are discussed in terms of developmental psychopathology, with particular attention to the finding that (a) developmentally maladaptive behavior can be identified at very young ages, even in 2-year-olds, and (b) that such behavior problems are far more persistent than hitherto believed. Such findings underscore the importance of early identification and intervention.
Maternal warmth as a protective factor against risks associated with peer rejection among children
Authors: Patterson Charlotte J. , Cohn Deborah A. , Kao Barbara T.
Published: October 2008

This study examined the relationship among children's sociometric status, qualities of mother-child interaction, and children's adjustment in first grade. Eighty-one 6-year-old children and their mothers participated in laboratory play interactions the summer before the children entered first grade. The interactions were coded later for warmth and control on the part of both mother and child. During the fall, the first graders were given individual sociometric interviews, and children were classified as popular, average, neglected, and rejected. During the spring, teacher ratings of child behavior problems and child competence were collected. Results showed that although maternal warmth and children's sociometric status were unrelated, both were significantly related to behavior problems and competencies in school. Children who were rejected by their peers and whose interactions with their mothers were low in warmth were rated by teachers as having more behavior problems and as less competent in certain respects than other rejected children; the children characterized by peer rejection and low maternal warmth also gave self-reports of their own social acceptance and cognitive competence that were more discrepant from objective information than did other rejected children. These effects either did not occur or were less pronounced within the group of children who were not rejected by their peers. Results were thus consistent with the idea that high maternal warmth served as a protective factor against adjustment difficulties associated with peer rejection.
The utility of care: Behavioral decision analysis and the development of depression
Authors: Costello Elizabeth J.
Published: October 2008

The development of vulnerability to depression is examined from the point of view of one area of cognitive and affective functioning, the processing of information about the future. Drawing on research into how people make choices in an uncertain world, this article reviews how depression affects people's judgments about the relative utility, or subjective value, of different outcomes, and about the relative probability of those outcomes. A developmental model is proposed which suggests that children learn that some people are willing to incorporate into their own utility ordering for different outcomes the utility structure of the child–that is, to care about the child. The role of lack of perceived care in the development of depression is reviewed, and suggestions are made for applications of decision analytic methods to some critical questions concerning the role played by judgments about the future in the development of vulnerability to depression.
Patterns of adjustment problems and alcohol abuse in early adulthood: A prospective longitudinal study
Authors: Andersson Tommy , Bergman Lars R. , Magnusson David
Published: October 2008

This study focuses on the importance of patterns of adjustment problems in early adolescence and convictions for alcohol abuse in the mid-teens for the development of alcohol abuse manifested in early adulthood. The study was performed on a large and representative cohort of Swedish males, prospectively followed from age 13 to age 25. A person approach was applied in which the individuals and individual patterns of adjustment problems were the objects of interest, not single variables per se. The results showed that patterns of multiple adjustment problems in early adolescence, as well as convictions for alcohol abuse in the mid-teens, significantly increased the risk for later alcohol abuse. Among multiproblem boys also convicted for alcohol abuse in their mid-teens, 72% were registered for alcohol abuse at ages 18–24. However, early single adjustment problems did not significantly increase the risk for later alcohol abuse. The importance of studying the background of alcohol abuse from a developmental and interactionistic perspective was emphasized.
The theoretical implications of joint-attention deficits in autism
Authors: Mundy Peter , Sigman Marian
Published: October 2008

Deficits in gestural joint-attention behaviors are a prominent feature of young autistic children. Attempts to explain these deficits have called upon the metarepresentational deficit hypothesis (Baron-Cohen, 1988; Leslie & Frith, 1988). However, developmental research suggests that joint-attention skills emerge prior to the cognitive capacity for metarepresentation. Thus, the metarepresentational hypothesis does not appear to provide a parsimonious explanation of autistic joint-attention deficits. An alternative model is proposed that attempts to explain these deficits in terms of the combined negative impact of developmental disturbances in affective, as well as cognitive, processes.
The autistic child's impaired conception of mental states
Authors: Harris Paul L.
Published: October 2008

I argue that Mundy and Sigman (1989) are right to question Leslie's (1987) explanation of the autistic syndrome, but that they do so for the wrong reasons. They assert that there is a lag between the emergence of joint-attention and pretence. However, evidence for the lag is equivocal because it depends on the behavioral criteria for each skill. Moreover, even if there were a lag, it could be argued that the relatively early appearance of joint-attention simply shows that a decoupling device is available before its recruitment for pretence. More problematic, with regard to Leslie's theory, is the finding that autistic children can engage in certain forms of pretence. This result suggests that autistic children suffer not from a general incapacity to conjure up imaginary entities or properties, but from a more specific impairment in the ability to imagine mental states that they are not currently experiencing.
Autism and ostensive communication: The relevance of metarepresentation
Authors: Leslie Alan M. , Happé Francesca
Published: October 2008

Recent empirical and theoretical work on both normal and pathological development has led to the formulation of the metarepresentational conjecture for autism. This account of autistic development links the core impairments in imaginative abilities, communicative skills, and social competence to dysfunction of a single set of underlying cognitive mechanisms. In this context, Mundy and Sigman (1989) argue that the impairment of early gestural communication in autism cannot be accounted for by the metarepresentational theory. On the contrary, this early communication impairment in autism is highly consistent with a faulty theory-of-mind module. In normal development, this module is available from around the first year to handle estensive communication – shared pretense being a prime, though slightly later, example. We briefly consider the role in communication of perceptual processes that may trigger metarepresentation. This early theory-of-mind module, with its metarepresentational processes, provides the specific developmental basis for later versions of the child's theory of mind.
Second thoughts on the nature of autism
Authors: Mundy Peter , Sigman Marian
Published: October 2008

This article presents our response to the comments of Baron-Cohen, Harris, Hobson, and Leslie and Happé. We suggest that a singular cognitive hypothesis does not provide a parsimonious explanation of autism. We argue that certain aspects of autism, including observations of joint-attention deficits and observations of deficits in the prosodic elements of speech, may best be explained in terms of both cognitive and affective factors. We also acknowledge the validity of the criticism of our contingency processing deficit hypothesis (Mundy & Sigman, 1989a). In response to this criticism, we offer a modification of our model of joint-attention skill deficits in autistic children.
Identity formation in suicidal and nonsuicidal youth: The role of self-continuity
Authors: Ball Lorraine , Chandler Michael
Published: October 2008

Adolescents attempt to end their own lives with greater frequency than do either younger or older persons. The aim of this study was to provide a developmental account of this anomaly by examining the contrastive ways in which suicidal and nonsuicidal adolescents reason about their own personal continuity through time. Drawing upon an earlier program of normative research into the links between a maturing sense of personal continuity and the development of a sense of commitment to the future, and capitalizing on recent methodologic advances in the study of young persons' maturing sense of self-continuity, a series of comparisons were made between 30 psychiatrically hospitalized adolescents, at varying degrees of risk to suicide, and a matched control group of their nonsuicidal agemates. The results of this study show that, while almost all of the hospitalized adolescents evidenced some degree of developmental immaturity in their attempts to reason about their own identity across time, the high-risk suicidal group was unique in their special inability to locate any grounds upon which to justify their own continuity through time. These findings are interpreted in terms of their relevance for understanding both the normal identity formation process, and for the diagnosis and treatment of adolescents at special risk to suicide.
Characteristics of attachment organization and play organization in prenatally drug-exposed toddlers
Authors: Rodning Carol , Beckwith Leila , Howard Judy
Published: October 2008

Prenatally drug-exposed toddlers were compared to preterm toddlers of similar low socioeconomic status, ethnicity, and single-parent households on intellectual functioning, quality of play, and security of attachment to the primary caregiver. The drug-exposed toddlers had significantly lower developmental scores, less representational play, and the majority had insecure, disorganized, avoidant attachments. In all areas investigated, the prenatally drug-exposed toddlers showed more subtle behavioral deficits within each domain. Although developmental quotients were within the average range, they were significantly lower than the preterm comparison group and did not adequately represent the more evident deficits seen through play in an unstructured situation. Unstructured assessments that required the child's initiation, goal setting, and follow-through were more revealing of developmental disorganization within and among domains than were adult structured assessments such as developmental tests. While modest differences were seen in structured tasks, the marked differences between the drug-exposed and preterm groups were most evident in the unstructured tasks. The lack of coherence across developmental domains was illustrated by the large difference between developmental quotient scores and the poor performance in the cognitive representional competencies demonstrated in play. Insecurity and disorganization in attachment were found to compromise further the development of the drug-exposed toddlers.
Childrearing history, marital quality, and maternal affect: Intergenerational transmission in a low-risk sample
Authors: Belsky Jay , Youngblade Lise , Pensky Emily
Published: October 2008

In order to test the hypothesis that the relation between childrearing history and parental behavior varies as a function of marital quality, retrospectively reported childrearing histories obtained from 92 middle- and working-class mothers-to-be in the last trimester of pregnancy were used to predict maternal positive and negative affect when children were 3-years-old. As anticipated on the basis of findings from high-risk samples, the intergenerational transmission process appeared to vary as a function of marital quality, with problematic histories predicting negative maternal affect when marriages were less positive/more negative and supportive histories predicting positive maternal affect when marriages were more positive/less negative. Unanticipated results also revealed that reports of supportiveandrejecting parenting in childhood were associated with low-negative maternal affect when marriages were of high quality. These findings were interpreted in terms of buffering and gatekeeping processes, whereby marital quality defines both conditions of continuity and discontinuity with respect to the intergenerational transmission of parenting. Follow-up analyses revealed that physical attractiveness might determine which women with more problematic childrearing histories end up in more positive/less negative marriages that function protectively with respect to the intergenerational transmission of parenting. These results are particularly relevant to the study of developmental psychopathology not only by revealing risk and protective factors, but also by showing that processes at work in high-risk samples also seem to function under lower risk conditions.
Heterogeneity of causes for delinquency and criminality: Lifespan perspectives
Authors: Dilalla Lisabeth Fisher , Gottesman Irving I.
Published: October 2008

This review of family, twin, and adoption studies on offender behaviors points to the importance of a genetic predisposition as a partial explanation for criminality in some populations. Twin and adoption studies show that criminality increases with the presence of criminality in biological relatives; the environmental effects of having a criminal adoptive parent also increase the risk of adoptee criminality. Delinquency is described developmentally as a fairly typical phase for many adolescents. Because of the high base rate for delinquency, any genetic predisposition for offense behaviors may be difficult to uncover in adolescence. Three groups are differentiated that may aid in this detection:continuous antisocialsare delinquents who continue to be criminal as adults;transitory delinquentsare delinquents but not criminals; andlate bloomersare criminals but not delinquents.
An affective-cognitive model of mother-child aggression
Authors: Mackinnon Carol E. , Lamb Michael E. , Belsky Jay , Baum Cynthia
Published: October 2008

This article reviews literature that explains the development and maintenance of aggressive mother-child interactions using operant learning theory, highlighting limitations in its explanatory power. We also review research on the association between perceptions and the maintenance of aggressive interactions. An integrative, multipathway model of mother-child aggression is presented in which the affective-cognitive biases of mothers and children and measures of their coerciveness help explain and predict subsequent coercive interactions. We conclude with implications for intervention.
Gaze behavior in autism
Authors: Volkmar Fred R. , Mayes Linda C.
Published: October 2008

Gaze behavior was assessed in 20 autistic individuels and in an age- and mental-age-matched mentally retarded control group. A time-sample technique was used to collect frequency of gaze directed at staff, at task, and elsewhere (at other) in familiar educational settings as subjects interacted with familiar staff and engaged in familiar educational activities. Gaze behaviors were sampled in each of three interactional conditions defined by staff-subject ratio. Significant effects of the intensity of the interactional condition were observed for both groups. Overall autistic subjects were more likely to look elsewhere than the matched control cases and looked less at staff during one-to-one interaction. Relationships to age, developmental level, and other measures are discussed.
Mother-child dynamics in early-onset depression and childhood schizophrenia spectrum disorders
Authors: Cook William L. , Asarnow Joan R. , Goldstein Michael J. , Marshall Valerie G. , Weber Edith
Published: October 2008

Family interaction patterns were compared for children with depressive disorders and children with schizophrenia spectrum disorders (SSD). Results indicated that compared to SSD children, depressed children were less positive and more negative when interacting with their mothers. Additionally, depressed children did not significantly reciprocate positive or negative statements initiated by their mothers, whereas reciprocity of both positiveness and negativeness was a significant characteristic of the SSD children. While no between group differences were found in the base rates of mothers' positive and negative responses, mothers of SSD children were more likely than mothers of depressed children to reciprocate child negativeness. Maternal reciprocity of positive statements, while not discriminating diagnostic groups, was a significant characteristic only of mothers of depressed children. The implications of these results for theories of developmental psychopathology are discussed.
The relationship of adolescents' expectations and values to delinquency, hard drug use, and unprotected sexual intercourse
Authors: Allen Joseph P. , Leadbeater Bonnie J. , Aber J. Lawrence
Published: October 2008

This study examined adolescents' expectations and values about how competent behaviors would work for them in difficult social situations and explored the relation of these appraisals to adolescents' delinquency, drug use, and sexual intercourse without use of adequate birth control. Several lines of research on the determinants of adolescent achievement motivation, social competence, and various problem behaviors are integrated within a unified framework based on both motivational and cognitive-social learning theories. One hundred adolescents at-risk for problematic behaviors, aged 15½–18, received structured interviews measuring their expectations of self-efficacy in performing socially competent behaviors, their expectations about the outcomes of these behaviors, their values toward these behaviors, their perceptions of the values of peers, and their identification with the values of important adults. Adolescents also reported their recent levels of delinquency, hard drug use, and unprotected sexual activity. Adolescents' expectations and values were significantly related to all three problem behaviors; males' low efficacy expectations and females' lack of identification with an adult's values were the strongest correlates of problem behaviors. Adolescents' expectations and values are considered as potentially important aspects of adolescents' models of themselves in social interactions, which may mediate the link between problematic family relationships in childhood and deviant behavior in adolescence.
Nonshared experiences within the family: Correlates of behavioral problems in middle childhood
Authors: Dunn Judy , Stocker Clare , Plomin Robert
Published: October 2008

One of the most dramatic findings from quantitative genetic research is that environmental influences shared by siblings in a family do not make the siblings similar in terms of psychopathology. Sibling resemblance for psychopathology appears to be genetic rather than environmental in origin; environmental influences that affect the development of psychopathology must be nonshared and make children in the same family different rather than similar. This study sets out to identify environmental factors that differ for young siblings and to assess associations between such nonshared factors and differences in the older siblings' outcome in two domains: internalizing and externalizing behavior problems. Maternal interview and observations of differential maternal and sibling behavior were compared within 67 sibling dyads (younger and older siblings aged 4 and 7 years, respectively, on average), and differential experiences were related to the adjustment of the older sibling, as assessed by mother and teacher. Differential maternal behavior appeared to be particularly important as a predictor of adjustment problems. Older siblings showed internalizing problems in families in which mothers were less affectionate to the older than to the younger sibling. Greater maternal control toward the older than the younger sibling predicted both internalizing and externalizing problems. Differential maternal behavior explained 34% of the variance of internalizing behavior and 27% of the variance of externalizing behavior problems, independent of variance explained by family structure variables. Although the sample was unselected for psychopathology and was too small to permit analyses of the diagnosable extremes of internalizing and externalizing dimensions, these results are encouraging in relation to the goal of identifying systematic sources of nonshared environment that affect the development of psychopathology.
Mothers' use of imitative play for facilitating social responsiveness and toy play in young autistic children
Authors: Dawson Geraldine , Galpert Larry
Published: October 2008

The effectiveness of imitating an autistic child's actions as a means for promoting social responsiveness and creative toy play was explored. Fifteen autistic children between the ages of 2 and 6 years and their mothers were assessed before and after a 2-week period during which they engaged in imitative play for 20 minutes per day. At the pre-intervention assessment, autistic children's gaze at mother's face was of longer duration, and their toy play was more creative during imitative play than during a free play session. At the post-intervention assessment, significant cumulative increases in duration of gaze at mother's face and creative toy play were found. Children's positive behavior changes were not found to be a function of developmental level of imitative ability, play skills, Vineland social age, IQ, or severity of autistic symptoms. Instead, the majority of children showed positive responses to this interactive strategy, regardless of these individual characteristics.
What mental retardation teaches us about typical development: The examples of sequences, rates, and cross-domain relations
Authors: Hodapp Robert M. , Burack Jacob A.
Published: October 2008

The developmental approach toward mental retardation historically has examined whether retarded individuals behave as do nonretarded individuals. An alternative approach involves using data from handicapped populations as “experiments of nature” to provide information about typical developmental processes. Three examples of this use of mental retardation findings include examinations of sequences, rates, and cross-domain relations. Certain instances of universal sequences appear to have been replicated by findings from children with mental retardation, but in other cases mentally retarded children help illustrate the extremes to which certain individual styles of development can be taken. Changing rates of development in different types of retarded children sometimes appear due to changes in the developmental tasks facing the child, sometimes to changes in neurobiologic factors related to chronological age. Cross-domain findings from children of diverse etiologies suggest the necessity of certain, specific connections among seemingly disparate behaviors in development. The article concludes with a discussion of mental retardation research as an experiment of nature that serves to replicate and amplify existing findings as well as to spur new extensions of developmental theory.
Psychopathy and moral development: A comparative study of delinquent and nondelinquent youth
Authors: Chandler Michael , Moran Thomas
Published: October 2008

Sixty male adjudicated juvenile delinquents between the ages 14–17, and 20 nondelinquent controls were administered measures of moral reasoning, social convention understanding, interpersonal awareness, socialization, empathy, autonomy, and psychopathy in an effort to explore the relations between moral reasoning, moral sentiment, and antisocial behavior. Not only did the delinquent group evidence developmental delays on all of these direct and indirect tests of morality functioning, but their performance on certain of these measures also differentiated those offenders who were more or less psychopathic. By demonstrating the special contribution of measures of moral will or sentiment to the study of antisocial behavior, these findings serve to underscore the multidimensional character of moral development, and the complexity of the relations between thought and action.
Antecedents of problem behaviors in children of depressed mothers
Authors: Zahn-Waxler Carolyn , Iannotti Ronald J. , Cummings E. Mark , Denham Susan
Published: October 2008

Aggression observed in 2-year-old children of well and depressed mothers was examined in relation to problem behaviors at ages 5–6. Both normative (e.g., object struggles, rough play) and maladaptive (e.g., dysregulated, out-of-control behavior) forms of toddler aggression were identified. Dysregulated aggression predicted (a) externalizing problems reported by mothers when children were 5 years old, and (b) children's reports of difficulties during a structured psychiatric interview at age 6. Problems were more frequent and continuity patterns more evident in children of depressed, than well, mothers. Early maladaptive aggression was a better predictor of later externalizing, than internalizing problems. Childrearing practices of mothers of toddlers also appeared to contribute to later outcomes: negative influences were evident but protective patterns were present as well. Depressed mothers who used proactive childrearing approaches (e.g., anticipating the child's point of view; exerting modulated, respectful control; providing structure and organization during play environment) had children who showed fewer externalizing problems 3 years later.
Prenatal exposure to alcohol and school problems in late childhood: A longitudinal prospective study
Authors: Olson Heather Carmichael , Sampson Paul D. , Barr Helen , Streissguth Ann P. , Bookstein Fred L.
Published: October 2008

The population-based Seattle Longitudinal Prospective Study on Alcohol and Pregnancy unites the fields of developmental psychopathology and behavioral teratology. Examining prenatal biological influences on childhood learning problems, this report is the first to extend earlier findings of alcohol-related deficits into late childhood. This follow-up study of 458 singletons assesses the degree to which children's classroom behavior and achievement difficulties at age 11 are predicted by prenatal alcohol exposure across the full spectrum of maternal use. Partial least squares statistical techniques are used to summarize complex multiple measures of exposure and outcome as latent variables. Accounting for many factors potentially important in development, analyses reveal a significant and subtle dose-response relationship between prenatal alcohol exposure and children's school performance a decade later. Maternal binge drinking (five or more drinks per occasion) and drinking during very early pregnancy are particularly salient for children's poorer school performance. A wide variety of problematic classroom behaviors, including attentional, activity, information-processing, and academic difficulties, are salient for prenatal alcohol exposure. Considered within the body of data on alcohol teratogenesis, these findings suggest that prenatal alcohol exposure has an enduring and predictable relationship with developmental difficulties through late childhood. Clinical, research, and public health implications are discussed.
The role of eye contact in goal detection: Evidence from normal infants and children with autism or mental handicap
Authors: Phillips Wendy , Baron-Cohen Simon , Rutter Michael
Published: October 2008

One reason for looking at a person's eyes may be to diagnose their goal, because a person's eye direction reliably specifies what they are likely to act upon next. We report an experiment that investigates whether or not young normal infants use eye contact for this function. We placed them in situations in which the adult's action toward them was either ambiguous or unambiguous in its goal. Results showed that the majority of normal infants and young children with mental handicap made instant eye contact immediately following the ambiguous action but rarely after the unambiguous action. Young children with autism, in contrast, made eye contact equally (little) in both conditions. These results are discussed in relation to the function of eye contact, to our understanding of infant cognition, and to the theory of mind hypothesis of autism.
A transactional analysis of early childhood anxiety and social withdrawal
Authors: LaFrenière Peter J. , Dumas Jean E.
Published: October 2008

The Preschool Socio-affective Profile, an 80-item teacher rating scale, was used to classify 126 French-Canadian children into three equal groups: socially competent (SC), average (AV), and anxious-withdrawn (AW). Mother-child interactions during a problem-solving task were observed. Base rates and conditional probabilities were calculated to assess the extent to which subjects responded contingently to each other's behaviors and affect. Children in all three groups exhibited a high degree of positive and negative reciprocity. SC children expressed more positive affect than AV or AW children and were more cooperative than AW children, who expressed more negative affect than either the SC or AV children. Mothers of the SC children displayed more positive behaviors and affect, were more contingent, and were more coherent in their discipline than all other mothers. Mothers of AV children were both less reciprocal with their child and less coherent than SC mothers. Failing to reciprocate positive affect or behavior, AW mothers engaged in a high degree of negative reciprocity and superfluous control and were aversive in response to compliance and noncompliance. These results are discussed from a developmental, transactional perspective, and their implications for an intervention strategy are considered.
Mourning or early inadequate care? Reexamining the relationship of maternal loss in childhood with adult depression and anxiety
Authors: Bifulco Antonia , Harris Tirrill , Brown George W.
Published: October 2008

Two population enquiries in Walthamstow and Islington, London, have shown that loss of the mother before the age of 17 years, either by death or separation for a year or more, doubles the risk of depressive and anxiety disorders among adult women. Furthermore, there was a particularly high rate of adult depression among those whose mothers died before they were 6 years old, and this was associated with a measure of childhood helplessness. There was no such link of either adult disorder or childhood helplessness with age at loss under 6 years for those losing a mother by separation. Two possible explanations were explored for these contrasting results. That concerning the adequacy of mourning of the mother's death received no support. However, evidence indicated that experience with the mother before the loss (usually affected by ongoing illness) explained the link of adult depression or anxiety with her early death. The failure of age at loss to relate in the separation group was probably due to the fact that among them age of separation was not a good indication of the quality of maternal care before age 6. Indirect evidence emerged which suggested that quality of early attachment (before age 6) to the natural mother before any loss relates to childhood helplessness. This in turn relates to a higher risk of disorder in adult life.
Depressive symptoms in black and Puerto Rican adolescent mothers in the first 3 years postpartum
Authors: Leadbeater Bonnie J. , Linares Oriana
Published: October 2008

While depressive symptoms in adolescent mothers may affect both their own and their babies' development, little research has focused on the mothers. Self-reported symptoms on the Beck Depression Inventory were collected at 1, 6, 12, and 28–36 months postpartum. Concurrent and reciprocal longitudinal relations among symptom levels, stressful life events, and social supports were investigated. Symptom levels declined over the four assessments, with changes in somatic, rather than cognitive affective, symptoms accounting for the decrease. Stressful life events and all sources of social supports predicted concurrent levels of depressive symptoms, but only social supports predicted declines in symptoms in the first year postpartum. Reciprocally, depressive symptoms tended (p = .06) to predict increases in stressful life events over time. Mothers were also categorized as reporting few (50%), intermittent (27.5%), or chronic (22.5%) symptoms in the first 12 months postpartum. Intermittently and chronically depressed mothers perceived their own mothers as less accepting than nondepressed mothers. Compared to nondepressed and intermittently depressed mothers, chronically depressed mothers also reported more stressful life events, were more likely to live alone, and experienced more moves by 28–36 months postpartum. The reciprocal causal relations among depressive symptoms, stress, and attachments to grandmothers and peers are discussed.
Mark Twain meets DSM-III-R: Conduct disorder, development, and the concept of harmful dysfunction
Authors: Richers John E. , Cicchetti Dante
Published: October 2008

The Diagnostic and Statistical Manual (3rd ed., rev.) (DSM-III-R) diagnosis of conduct disorder assumes that all children who engage in three or more criterion antisocial behaviors for 6 months or more suffer from a mental disorder. It resists all contextual information about a child's developmental history, capacities, strengths and circumstances, and assumes that the antisocial behavior necessarily stems from an underlying disorder. In this review, we use Mark Twain's narrative of the lives of Tom Sawyer and Huckleberry Finn as a point of departure for questioning the reasonableness of this assumption, and for examining normal as well as pathological pathways to antisocial behavior. We begin by reviewing the status of earlier controversies about the mental disorder concept in the service of documenting the impressive progress of the field in conceptualizing disorder. Next, we examine Wakefield's (1992a, 1992b) recently introduced “harmful dysfunction” concept of mental disorder and employ its criteria to evaluate the hypothesis that chronic antisocial behavior in childhood as defined by DSM-III-R is caused by an underlying mental disorder. We also examine some of the difficulties in discriminating between disorder- and nondisorder-based antisocial behavior, and consider issues that warrant attention in future theoretical and empirical work. Finally, we explore the pragmatic rather than scientific basis for DSM-III-R's mental disorder claim and argue that regardless of its status as a mental disorder, this most troubling and harmful behavior syndrome of childhood deserves the intensive interest, concern, and resources of the scientific and public health communities.