A Multivariate Analysis of the Self-Determination of Adolescents

Self-determination is a general psychological construct within the organizing structure of theories of human agentic behavior. People who are self-determined act volitionally to serve as the causal agent in their lives. To provide a fuller understanding of the self-determination of adolescents, this study collected data on self-determination, quality of life, self-efficacy, and assertiveness for more than 1,400 Italian adolescents. We conducted a series of Multivariate Analyses of Variance to examine the relationships among, differences between, and associations with self-determination, including any differences as a function of age and gender as well as differences in quality of life, self-efficacy, and assertiveness as a function of level of selfdetermination. We also examined which quality of life factors were associated with enhanced self-determination and self-efficacy. Findings support the importance of self-determination to quality of life and enhanced self-efficacy.     

Hypothalamic-pituitary-adrenal axis reactivity in the preschool-age offspring of depressed parents: moderation by early parenting

The hypothalamic-pituitary-adrenal axis is thought to play a role in the pathogenesis of depression. In the study reported here, we tested the hypothesis that parenting behavior moderates the relation between parents' lifetime history of depression and their offspring's cortisol reactivity to a psychosocial stressor. We exposed 160 preschool-age children to stress-inducing laboratory tasks, during which we obtained four salivary cortisol samples. Parents completed clinical interviews and an observational parent-child interaction task. The results confirmed our hypothesis: The offspring who evidenced high and increasing cortisol levels were those whose parents had a history of depression and demonstrated hostility toward their child. This moderating effect was specific to offspring who were exposed to maternal depression during the first few years of life. As do findings in animals, results of this study underscore the importance of the early rearing environment in the intergenerational transmission of stress sensitivity.     

Associations between authoritative parenting and the sun exposure and sun protective behaviours of adolescents and their friends

Associations between the sun exposure and sun protective behaviours of adolescents and their friends were examined along with the role played by authoritative parenting and other family and peer socialisation factors. Four hundred and two adolescents (198 males, 204 females) participated in the research. It was found that these adolescents and their friends shared similar sun exposure and sun protective behaviours and had similar parenting backgrounds. Parental authoritativeness was positively associated with the use of sun protection, even after the effects of other familial and peer variables were controlled, but not with the time spent sunbathing which was associated with friends' behaviours. The theoretical and practical implications of these findings are discussed.     

Book reviews

Gelman, R. and Gallistel, C. R. The Child's understanding of Number. Cambridge, Mass.: Harvard University Press. 1978. Pp. 260. ISBN 0 674 11636 4. £9.45.

Boden, M. A. Piaget. London: Fontana. 1979. Pp. 174. ISBN 000 635537 4. £1.25.

Vygotsky, L. S. Mind in Society. Cambridge, Mass: Harvard University Press. 1979. Pp. 159. ISBN 0 674 57628 4. $12.50.

Catania, A. Charles. Learning. Englewood Cliffs, N.J.: Prentice-Hall. 1979. Pp. xi + 406. ISBN 0 13 527432 X. $16.95 £11.00.

Kagan, J., Kearsley, R. B. and Zelazo, P. R. Infancy: Its place in Human Development. Second edition. Cambridge, mass.: Harvard University Press. 1979. Pp. 462. ISBN 0 674 45260 7. $17.50.

Shaffer, D. and Dunn, J. (Eds). The First Year of Life: Psychological and Medical Implications of Early Experience. Chichester: Wileys. 1979. Pp. 221. ISBN 0 471 99734 X. £11.80.     

An account of human “impulsivity” on self-control tasks

Three experiments examined the effects of economic constraint (time restriction—trials restriction) on adult humans' performance on concurrent chained schedules of reinforcement in which terminal links differed both in reward size and pre-reward delay levels. In the first, terminal links offered a long delay (20, 30, 40, 50 sec) followed by 2 points, or a short delay (10 sec) followed by 1 point. Initial links consisted of the same variable interval schedules for each alternative. Subjects showed a conditional sensitivity to increases in delay. Under a time constraint, there was an increasing preference for the smaller reward as the delay to the larger reward was increased, whereas under a trials constraint subjects were totally insensitive to such changes. In the second experiment, this finding was replicated using long and short periods of video game playing as large and small rewards. In the third experiment terminal link parameters remained constant (2 points after 15 sec, or 1 point immediately), but initial link parameters were manipulated (either VI 1-sec, 8-sec, or 20-sec) so that the higher relative rate of reward shifted from being associated with the small reward to being associated with the large reward. Again subjects chose differently under the two constraints. Subjects under the time constraint exhibited a preference for the small reward at all levels of initial link, but under the trials constraint subjects preferred the large reward. Subjects in the time constraint condition thus exhibited a maladaptive insensitivity to changes in the initial link duration. These findings are interpreted as supporting a miscalculation rather than a discounting interpretation of human performance on “self-control” tasks.     

Discrimination of five-dimensional stimuli by pigeons: Limitations of feature analysis

Pigeons were trained to discriminate between stimuli constructed using five orthogonal two-valued features. The stimuli consisted of stylized monochrome drawings of seeds. Two different training procedures (conditional and simultaneous discrimination) were used. In the first two experiments, the discrimination required was between polymorphous categories, in which a positive stimulus was defined as one in which three or more of the five features took their positive values. Discrimination in both experiments was imperfect; the pigeons' behaviour only came under the control of a subset of the available features (one to three in Experiment 1, three or four in Experiment 2). In Experiment 3, single features had to be discriminated, while the remaining features varied. It was found that all five features of the “seed” stimuli could be discriminated, but one of them was exceptionally difficult. The results show that pigeons do not reliably use all the features available to them when making category discriminations. This casts doubts on feature analysis as a basis for the excellent performance pigeons show when required to discriminate between categories of natural objects.