Acquisition and extinction of signaled avoidance as a function of intermittent reinforcement

Signaled, shuttle-box avoidance responding in female rats of the Fischer₃₄₄ strain was examined as a function of four separate contingencies of intermittent reinforcement. In Experiment 1, when avoidance responses during acquisition were reinforced 25% of the time with prompt CS termination, animals responded equally often during acquisition and significantly more often during extinction than animals who received such reinforcement on a 100% schedule. Similar results were found under a trace procedure in Experiment 2 when avoidance responses were reinforced 25% of the time with informational feedback stimuli. In contrast, during Experiment 3, when animals were shocked on only 25% of the trials on which they failed to respond, the level of avoidance responding during both acquisition and extinction was significantly less than it was when animals were shocked on a 100% schedule. Comparable results were found in Experiment 4 when avoidance responses during acquisition averted shock on only 25% of the trials. Thus, intermittent reinforcement contingencies involving response-contingent feedback stimuli and shock have differential effects on avoidance responding during both acquisition and extinction trials under the signaled avoidance procedure.     

CHILD BEHAVIOR AND DEVELOPMENT

l'A. présente une analyse behavioriste du développement de l'enfant, qui est l'application à un domaine spécialisé d'une approche behavioriste de la psychologie générale. Il montre tout d'abord ce qu'est l'analyse behavioriste, en examinant successivement quelle philosophie de la science elle implique, et quels en sont les concepts, les principes, les bases méthodologiques essentielles et les applications pratiques. Il évoque, ensuite, comment se posent dans une telle perspective, les problèmes que I'on retrouve constamment dans l'étude du développement de l'enfant : liaison entre hérédité et milieu, nature psychologique de l'enfant, stades du développement, recherches des moyennes par âge ou recherches longitudinales. Il termine par un bref bilan des contributions de l'analyse behavioriste à l'étude du développement de l'enfant, en s'attachant particulièrement au fait qu'elle a fait progresser les méthodes de recherche, permis de préciser et de compléter les concepts et les principes, et démontré la valeur pratique des principes.     

Interaction Effect of Extrinsic Rewards and Socioeconomic Strata

In an attempt to account for the poor test performance of lower-SES children, two conflicting theories were examined: (a) the early damage theory holds that lower-SES children have undergone such early and intensive deprivation that they cannot perform in testing situations; (b) the alienation theory contends that the public schools are middle-class institutions with middle-class intrinsic rewards which do not motivate lower-SES children. When faced with the testing situation the children choose not to perform. In order to test these theories, upper- and lower-SES students (N = 250) were randomly assigned to extrinsic and conventional reward conditions. The multivariate analysis of co-variance techniques indicated a significant (.01 level) improvement in the test performance of lower-SES children when extrinsic (money, food) rewards, as well as conventional rewards, are offered. Extrinsic rewards did not significantly improve the test performance of upper-SES children.     

How efficacious, caring samaritans cope when their help is rejected unexpectedly

This experiment, with 167 introductory psychology subjects, successfully replicated and extended to a wider array of affective, evaluative, and cognitive reactions, previous research on how would-be helpers cope when their help is rejected. It again supported the thesis that violation of perceived expectancy of acceptance mediates the effects of rejection. Using an individual difference measure of generalized self-perceptions of being a person who is sufficientlyefficacious and caring (acronym, EFCA) to help others, we found support for the predictions that high EFCAs would react more strongly than low EFCAs on “proximal” forms of coping, but relatively less strongly on “confrontational” (future-oriented) forms. Our rationale was that high EFCAs expect more acceptance, are more optimistic, and have greater self-investment in the outcome. Mixed support was obtained for the prediction that situational differences in prior expectancy of acceptance moderate the effects of rejection. Portions of the research were presented by the first author at the 98th Annual Convention of the American Psychological Association, Boston, August 1990.     

Psychological differentiation and the evaluation of juridic information: Cognitive and affective consequences

The cognitive and evaluative involvements of field dependence-independence in the processing of available information were examined in two experiments. In Experiment 1, ninety-six female undergraduates were assigned to field-dependent and field-independent conditions (via a median split on Embedded Figures Test scores). Half were given information about the trial of a man accused of attempted manslaughter that was suggestive of guilt; the other half received information suggestive of innocence. They were asked to indicate their confidence in the guilt or innocence of the defendant, and to recall arguments from the information they received. Field-dependent subjects were significantly more extreme in their confidence judgments, particularly in the exonerating conditions. They also showed nonsignificantly poorer recall. In Experiment 2, forty-eight subjects from Experiment 1 were given arguments biased in the opposite direction of their original sets. Field-dependent subjects were significantly more likely to shift their confidence judgments and report discomfort when the new information suggested innocence, and to underrecall new information when it suggested guilt. Field-dependent subjects again showed poorer recall. The results of both experiments were discussed in terms of their support for a field-dependence value bias and encoding deficiency.