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.

The relationship of various personality and behavior describing characteristics of the mother in earliest childhood (ages 1–3) and in later childhood (ages 6–8) to the child's registered criminality up to the age of 30 was investigated for a sample of 122 males. Maternal attributes were rated by psychologists and nurses. Canonical correlations, measuring the relationship between the set of maternal attributes in young age of the child and the future registered criminality of the subjects, were in the magnitudes of .40 to .50. Both in early and in later childhood, mother's mood and her perceived maturity were attributes that, controlled for socioeconomic status of the home and mother's age, were significantly related to the child's future criminal behavior. In addition, mother's affective attitude in later childhood was significantly related to registered crime among the subjects. The change in prognostic power of maternal attributes from early to later childhood was discussed.

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.

Longitudinal follow-up data for 69 very low birthweight preterm infants were used to assess the influence of four factors (neonatal medical complications, infant temperament, mother-child relationships, and family environment) on mother and teacher reports of behavior problems at 4 years. The proposed model of such influences being tested assumed that (1) the effects of neonatal medical factors would be indirect, and (2) each of the other three factors would show high stability from 1 to 4 years and would have a direct influence on behavior problem outcomes. Neither neonatal medical data nor infant-mother attachment were good predictors of behavior problems at age 4. With these exceptions, teacher report of behavior problems was predicted in a fashion consistent with the preliminary model. However, mother reports of behavior problems was predicted only by prior mother reports of child temperament. Discussion focuses on reasons for discrepancies in these pathways of influence.

When psychopathology is defined as developmental deviation, its study necessarily involves a wedding of research on the normal and the pathological. In such an endeavor, understanding of normal processes is enhanced, because critical normative issues can only be defined in terms of their implications when development goes awry and because disordered behavior often brings into sharp relief the nature of basic developmental phenomena. At the same time, such work is critical to defining general principles of development, which apply to normal and abnormal alike. In this article, examples are provided of the reciprocally enhancing nature of studies of normal and pathological development and of the fruitfulness of weaving back and forth between studies of normality and disturbance for understanding important aspects of development. Examples include a discussion of attachment and dependency and the origins of Attention Deficit/Hyperactivity Disorder. It is concluded that developmental psychopathology may make its greatest contribution in the endeavor to understand development of individuals.

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.

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.

This study tested the hypothesis that preschool-aged children with significant externalizing behavior problems are more likely to have insecure attachment relationships than nonproblem peers, as measured by separation/ reunion behavior at the time of clinic referral. Fifty children (ages 3–6) and their mothers participated: 25 referred to a child psychiatry clinic for one of the DSM-III-R Disruptive Behavior Disorders, and 25 matched comparison children without behavior problems. Using two new attachment coding systems for children of this age, we found that 84% of the children in the clinic group were classified as insecure, whereas only 28% of the comparison group were so classified (p <.001). Clinic children were also found more frequently to protest their mother's departure and to search for her more often during the separation. The implications of these results for the validity of separation/reunion behavior as an index of attachment at this age are discussed, as well as the methodological and conceptual problems that complicate our study of the link between attachment and behavior disorder.

Research in developmental psychopathology is used to examine and propose questions, concepts, and methods in the investigation of child development in the contexts of dysfunctional and well families. The adequacy of the data base for investigating the course of development, representing the socialization process, and identifying individualities and universals in development is discussed. A number of research issues that have been studied primarily in developmental psychopathology are recommended as relevant to normal child development. Multidomain and multisource longitudinal data are proposed as the means for better delineating development and for testing alternative models of developmental processes. Examples of data and experience are drawn from longitudinal studies of affectively ill parents and their children. Differences in the perspectives and approaches of normal child development research and developmental child psychopathology are discussed. The usefulness of thinking of two disciplines, normal child development and child development psychopathology, is questioned.

This article examines the frequency and stability of externalizing symptoms in a sample of 325 5-year-olds. Parent and teacher ratings, teacher nominations, parent-child interaction, and child measures were obtained. Using cutoff scores on teacher ratings, an average of 20% of the children were rated as having moderate externalizing problems in kindergarten and first grade. For both boys and girls, parent-teacher stability correlations ranged from .34–.45, and kindergarten teacher ratings from November and April correlated at .76. Instability in externalizing symptoms from kindergarten to first grade was related to a number of concurrent and previously assessed factors. For girls these included learning problems, shy-anxious behavior, mother-child interaction measures, and cognitive ability. Factors related to instability for boys included learning problems, social skills, cognitive ability, and self-control. These variables accounted for an additional 40% of the variance for boys (50% for girls) in first grade externalizing symptoms after controlling for externalizing symptoms in kindergarten.

The impact of environmental risk on toddlers' cognitive and linguistic development was investigated in a longitudinal study of 78 high-risk families. The risk factors examined were family social status, mother's psychosocial functioning, and quality of dyadic involvement at 1 year of age (including measures of mother-infant interaction and infant-mother attachment security). Child outcome measures included the Bayley MDI (at 24 months) and the Preschool Language Scale (at 36 months). The data indicate that dyadic involvement was an important mediator in the relation between environmental risk and subsequent child competence. Specific relations among early interactive experiences, infant attachment security, and subsequent cognitive and linguistic gain were examined within a framework of risk and protective factors. The results suggest that secure attachment may operate as a protective factor, but only among the more extreme cases in this exclusively high-risk sample.

Individual differences in attachment organization among adults with serious psychopathological disorders were related to strategies of treatment use. Forty young adults with serious psychopathological disorders were administered the Adult Attachment Interview (George, Kaplan, & Main, 1984), and their clinicians completed ratings of treatment use. Attachment organization was assessed using the Attachment Q-set (Kobak, 1989), yielding ratings of security/anxiety and avoidance/preoccupation. In preliminary analyses, diagnosis was found to be related to security, with greater security associated with affective rather than thought disorders. Gender was related to avoidance/preoccupation, with males having stronger avoidant tendencies than females. The effects of diagnosis and gender were partialled out of subsequent analyses. As predicted, greater security was associated with more compliance with treatment, as rated by clinicians. Stronger avoidant tendencies were associated with greater rejection of treatment providers, less self-disclosure, and poorer use of treatment. These findings suggest that attachment organization may be an important determinant of how individuals with serious psychopathological disorders approach attachment figures.

The study of clearly identifiable patterns of atypical development can inform normal development in significant ways. Delayed or deviant development puts in high relief not only the sequence of development but also the individual components. This article presents the results of studies that compare adolescents with Williams syndrome, a rare metabolic neurodevelopmental disorder resulting in mental retardation, with cognitively matched adolescents with Down syndrome. We investigate the interaction between affect and language through storytelling. In contrast to the adolescents with Down syndrome, the Williams syndrome subjects tell coherent and complex narratives that make extensive use of affective prosody. Furthermore, stories from the Williams but not the Down subjects are infused with lexically encoded narrative evaluative devices that enrich the referential content of the stories. This contrast in expressivity between two matched atypical groups provides an unusual perspective on the underlying structure of the social cognitive domain.

A multidimensional study examined individual differences in observed behavior of 59 depressed mothers interacting with their 3–13-month-old infants in relation to selected demographic and psychosocial variables. Maternal competence–defined as sensitive, affectively appropriate maternal behavior, was positively related to maternal education, family income, and the number of hours mothers worked outside the home. Maternal competence was inversely related to life stress, marital discord, poor social support, and infant difficulty; all of these relations appeared to be mediated by the women's feelings of self-efficacy in the maternal role. A “risk index,” composed of noncorrelated variables (family income, hours per week mother worked outside the home, and maternal self-efficacy), was strongly related to maternal parenting competence. These results suggest that the quality of depressed mothers' behavior with their babies is related to self-evaluations and contextual risk or protective factors. The findings also highlight the heterogeneity in life circumstances and functioning of depressed women and the probable resulting variability in the level of functioning of their children.

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.

This article reviews ways in which quantitative genetic approaches to developmental psychopathology can elucidate normal development. A few examples from genetics are discussed to highlight how investigations of abnormal functioning can inform the study of normal functioning. Two topics that provide bridges between the normal and abnormal are presented in greater detail. Most important is a new quantitative genetic technique that assesses empirically genetic and environmental links between the normal and abnormal. A second topic involves quantitative genetic approaches to environmental analyses, as highlighted by the examination of nonshared environmental factors. Such examinations of the environment are essential in studies of psychopathology, and their application to abnormal development can elucidate processes of normal development. We believe that forging links between the normal and abnormal is the core task of developmental psychopathology and that quantitative genetics is not only compatible with this goal, but essential to it.

This article examines what it means to have a self. My focus is on the essential components of self-experience, the kind of psychological architecture required to construct a self, rather than on the configurations or qualities of individual “selves.” I adopt a developmental perspective and indicate how early childhood autism may afford unique insights into the role of perceptual-affective and interpersonal experience in determining the normal child's developing awareness of self.

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.

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.