Fixed and optional stopping models for two-choice discrimination times

Several current models for choice- or discrimination-time experiments represent the stimulus as a sequence of independent and identically distributed observations. This paper develops and compares models based on two different stopping rules that a subject might use to terminate his sampling process and convert his perceptual evidence into an observable response. The fixed and optional stopping rules yield different predicted forms for the speed/accuracy tradeoff function and for the relation between mean and variance of response times. These predictions are developed in the general case and then specialized for certain conditions of symmetry, so that the expressions are easier to apply and to compare between models. A later section considers how changes in stopping criteria (either between or within experimental trials) affect predictions about mean response times for correct responses and errors, and then uses these ideas to relate the optional stopping rule for the Random Walk models to those of the Accumulator models. A final section considers specialized models for stimulus detection and intensity discrimination that assume Poisson-distributed sensory input, and relates these models to the present fixed stopping model.     

Expectation theories of decision making for duplex gambles

Complete tests of subjectively expected utility (SEU), subjectively expected value (SEV), expected utility (EU) and expected value (EV) theories were made for duplex gambles without measuring subjective probability or subjective utility. All gambles were hypothetical and offered on booklets. The duplex gambles consisted of winning gambles, which offered a chance to win a certain amount of money or to break even; and losing gambles, which offered a chance to lose a certain amount of money or break even.The results indicated that SEU, SEV and EU theories could not account for the strategies of 33%, 53% and 86% of the Ss respectively in the losing form of gambles, while EV theory accounted for 78% of the behavior of Ss.In the winning form of gambles, SEU, SEV and EU theory held for 77%, 65%, and 54% of the Ss respectively, while EV theory held for only 40% of the Ss. Suggestions for further research were made.     

The effect of vicarious punishment on prosocial behavior in children

Two experiments are reported dealing with the effects of vicarious punishment on prosocial behavior. In Experiment I, first and second grade females who witnessed a peer model being punished for a refusal to share (“nonsharing, punished”), shared more than an appropriate control group. Sharing was similarly heightened, however, in a group who witnessed punishment to the model which was not contingent upon any specific behavior (“punishment only”). Experiment II tested and confirmed the hypothesis derived from Experiment I that noncontingent vicarious punishment has a generalized inhibitory effect on antisocial behaviors. First, second, and third grade females were shown either the “nonsharing, punished,” “punishment only,” or baseline videotapes used in Experiment I. Subsequent to viewing the tapes, subjects in the “punishment only” condition helped the experimenter significantly more than did subjects in the “nonsharing, punished” and baseline conditions. The ability of existing theoretical treatments of vicarious punishment to account for these results is questioned.     

Performance expectancies and affect associated with outcomes as a function of time perspective

An experiment was conducted to investigate the effects of time perspective on performance expectancies and the subjective evaluation of outcomes in regard to a task at which subjects had previously succeeded or failed. Prior research has produced conflicting findings on the subjective evaluation of positive and negative outcomes, but some of the research has dealt with tangible rewards and punishments while other work has been concerned with performance outcomes involving tasks with which subjects were unfamiliar. In the current study subjects first succeeded or failed on either an easy or difficult task. They then stated performance expectancies and made evaluations of the affect associated with success and failure in regard to performing the task again immediately, in 3 wk, or in 21 wk. Results indicated a significant decrease over time for both the satisfaction associated with passing and the dissatisfaction associated with failure. Performance expectancies were significantly higher for the testing period of 21 wk in the future than for either the immediate or 3-wk testing period, but this difference was evidenced only for subjects who initially passed the test.     

The role of inference in children's comprehension and memory for sentences

In a series of studies, young children often failed to construct and remember inferred relationships which they were capable of understanding. A cued recall procedure was employed to assess the relative effectiveness of implicit and explicit word prompts for sentence memory. The implicit cues were much less effective than the explicit cues for 6–7 yr old children while the cue types did not differ for 11–12 yr olds. Instructions to imitate the actions described by the sentences eliminated the memory difference for the young children. Developmental improvement in spontaneous inferential operations and intentional plans to remember are mechanisms which appear to yield an elaborated memory representation and greater access routes through indirect and implied relationships.     

Covariation and temporal contiguity as principles of causal inference in young children

Four- to seven-year-old children observed a simple physical effect which could be attributed to either a consistent but noncontiguous covariate or a contiguous but inconsistent covariate. When there was a physical rationale for the temporal delay between covariate and effect, children attributed the effect to the consistent but noncontiguous covariate. In the absence of such a rationale, they attributed the effect to the contiguous but inconsistent covariate. It was concluded that neither consistent covariation nor strict temporal contiguity were essential aspects of causal inference for these children.     

A psychoanalytic reinterpretation of the effectiveness of systematic desensitization: Fact or fiction?

Silverman, Frank and Dachinger (1974) found support for their hypothesis that the effectiveness of systematic desensitization (SD) resides in its activation of unconscious, merging fantasies. Their subjects were subjected to a variant of SD. in which a procedure aimed at stimulating a fantasy of ‘merging with mother’ was substituted for muscle relaxation. This pro- cedure consisted of the tachistoscopic subliminal exposure of the symbiotic gratification stimulus mommy and i are one(experimental) or neutral stimulus people walking (control). The aim of the present study was to replicate their work with special reference to demand characteristics. using as subjects snake phobics. SD with a symbiotic gratification stimulus was not more effective than SD with a neutral stimulus, which may be explained by the fact that the neutral stimulus in the present study snake and I are one was more relevant than the neutral stimulus in the Silverman et al. study. Moreover, subjects with a therapy-set improved significantly more than subjects with a research-set.     

Effect of locus of control,expectancy confirmation-disconfirmation,and type of goal on causal attributions of failure

Two experiments demonstrated interactive effects between locus of control and expectancy confirmation-disconfirmation in determining attribution of failure. Experiencing an expected versus an unexpected failure significantly influenced the performance attributions of internals but not externals. The first experiment also demonstrated an interaction between locus of control and type of performance goal (self-determined versus other-determined) in determining failure attribution. When the performance goal was other-determined, there were significant differences between internals and externals in their attributions of failure, but these differences did not materialize when the performance goals were selfdetermined, in the absence of any externally defined standard. Interpretation of results focused on the differences between internals and externals in regard to information processing and certain cognitive characteristics as they are related to the attribution of outcomes.     

Effort is virtuous,but it's better to have ability: Evaluative responses to perceptions of effort and ability

Evaluative responses to imagined task outcomes were found to depend on the question asked, as well as on perceptions of effort and ability. When university students were asked when they would experience pride or shame, they indicated effort would increase pride over success and reduce shame over failure. On the other hand, when asked what type of person they would like to be they chose high ability regardless of outcome. This modified Weiner's (1972) statement of the relation of causal attributions and affective expression. Individual differences in responses to these questions related to differences in self-concept of ability. This result suggested extensions of the attributional analysis of achievement motivation.