Different is good: connectionism and dynamic systems theory are complementary emergentist approaches to development

Connectionist and dynamic systems approaches to development are similar in that they are both emergentist theories that take a very different perspective from more traditional symbolic systems. Moreover, they are both based on similar mathematical principles. Nevertheless, connectionism and dynamic systems differ in the approach they take to the study of development. We argue that differences between connectionist and dynamic systems approaches in terms of the basic components of the models, what they see as the object of study, how they view the nature of knowledge and their notions of developmental change mean that they each stand to make different and unique contributions to a more complete theory of development. We present an example from our work on how children learn to learn words that illustrates the complementary nature of connectionist and dynamic systems theories.     

Ontogeny of early event memory: I. Forgetting and retrieval by 2- and 3-month-olds

In 2 experiments, 2-month-olds, trained in the mobile conjugate reinforcement paradigm for two daily sessions, showed retrieval deficits relative to 3-month-olds. In Experiment 1, tests of simple forgetting administered to 2-month-olds after retention intervals of 1, 3, 6, and 9 days (a period over which 3-month-olds remember the contingency) indicated that their forgetting was complete after delays greater than 1 day. In Experiment 2, reactivation treatments administered to 2- and 3-month-olds alleviated forgetting after a retention interval of 28, but not 35, days in the 3-month-old group only. Previously, alleviated forgetting by a reactivation treatment had been demonstrated in 2-month-olds after a delay of 18 days. In both of the present experiments, performance of the two age groups did not differ during the immediate retention test at the end of training. These results suggest that neither the age of the infant nor the age of the memory determines memory retrieval after long delays; instead, it appears to be determined by the length of time that a memory has been inaccessible (i.e., forgotten). We propose that factors which delay simple forgetting will correspondingly increase the length of the interval over which a retrieval cue can still be effective in a reactivation paradigm, irrespective of the age of the infant or the age of the memory.     

Correlates and predictors of hyperactivity and aggression: A longitudinal study of parent-referred problem preschoolers

Forty-six parent-referred problem 3-year-olds and 22 comparison children were assessed with parent report and observational measures; 54 were followed up at age 4, and 53 were followed again at age 6. Lower social class and greater family stress were associated with higher symptom ratings at initial referral and age 6 follow-up. Negative and directive maternal behavior and negative and noncompliant child behavior observed in the lab at age 3 were associated with higher maternal ratings of child aggression and hyperactivity; these observed behaviors continued to be highly predictive of maternal ratings of persistent problems at ages 4 and 6. A laboratory index of inattention and overactivity at intake also predicted hyperactivity ratings at age 6. These findings suggest that externalizing problems identified in early childhood are likely to persist when they are associated with more family disruption and a negative mother-child relationship.This research was supported by Grant No. MH 32735 from the National Institute of Mental Health to Dr. Campbell. We are indebted to the children and families who have participated so enthusiastically in this study over the past 5 years. The help of Deborah Baldwin, Patricia Cluss, and Diane Gluck is gratefully acknowledged. Many additional people participated in various phases of this study as independent observers and data coders. Their contributions are also recognized.     

Gender differences in self-rated emotional expressiveness

The purpose of this investigation was to assess gender differences in the expression of different feelings as well as to examine the relationship between each gender's confidence in expressing different feelings and the target person's gender. The subjects, 100 male and 125 female psychology students at a community college, self-rated their confidence in expressing emotions by completing the Efficacy and Consequence Expectations for Social Skills (ECESS). Multivariate analyses and then univariate and post hoc analyses were performed. Findings indicated a significant interaction between subject gender and target person gender for confidence in expressing anger and love/liking/affection. Males reported lower confidence in expressing anger to females than did female subjects, and males were more confident expressing anger to men than to women. Females reported significantly higher confidence in expressing liking/love/affection to males than did male subjects. Female subjects were significantly more confident in expressing fear and sadness than male subjects regardless of the target person's gender. However, females did not report significantly more confidence in expressing loneliness than males with either target gender.     

The clinical vignette: Use in teaching and evaluation of group therapists

This paper describes the use of a written vignette as an aid in teaching group psychotherapy. Educators can determine in advance their expectations of the students' understanding of the vignette. Trainees evaluate the salient data, recognize patients' and therapist's contributions to the process, and conceptualize at three levels: intrapsychic, interpersonal and group-as-a-whole. This method supplements the usual training methods, and offers information about both the individual student and the entire class. This approach has an advantage of enabling educators to assess students in a relatively standardized fashion.