总被引：2，自引：2，他引：0  

B A Williams 《Journal of the experimental analysis of behavior》1993,59(1):163-172

During one component of a multiple schedule, pigeons were trained on a discrete-trial concurrent variable-interval variable-interval schedule in which one alternative had a high scheduled rate of reinforcement and the other a low scheduled rate of reinforcement. When the choice proportion between the alternatives matched their respective relative reinforcement frequencies, the obtained probabilities of reinforcement (reinforcer per peck) were approximately equal. In alternate components of the multiple schedule, a single response alternative was presented with an intermediate scheduled rate of reinforcement. During probe trials, each alternative of the concurrent schedule was paired with the constant alternative. The stimulus correlated with the high reinforcement rate was preferred over that with the intermediate rate, whereas the stimulus correlated with the intermediate rate of reinforcement was preferred over that correlated with the low rate of reinforcement. Preference on probe tests was thus determined by the scheduled rate of reinforcement. Other subjects were presented all three alternatives individually, but with a distribution of trial frequency and reinforcement probability similar to that produced by the choice patterns of the original subjects. Here, preferences on probe tests were determined by the obtained probabilities of reinforcement. Comparison of the two sets of results indicates that the availability of a choice alternative, even when not responded to, affects the preference for that alternative. The results imply that models of choice that invoke only obtained probability of reinforcement as the controlling variable (e.g., melioration) are inadequate.  相似文献   

    

Vincent J. Fortunato  Kevin J. Williams 《Journal of applied social psychology》2002,32(11):2321-2353

This study examined the effects of goal difficulty, negative affectivity (NA), and positive affectivity (PA) on performance and task attitudes on a complex task. Research participants played an air traffic controller (ATC) simulation and were assigned either an easy or difficult goal at 2 different points in time: early during skill acquisition, and after several experimental trials. We hypothesized that the effect of difficult goals would vary depending on whether they were administered early and late during skill acquisition. We also hypothesized that NA and PA would moderate the effect of goal difficulty. Neither the early nor late goal assignments related to performance or task attitudes as hypothesized. Instead, PA and NA both moderated goal‐outcome relationships.  相似文献   

    

Williams DC  Johnston MD  Saunders KJ 《Journal of the experimental analysis of behavior》2006,86(2):253-267

Two experiments compared delayed matching-to-sample (DMTS) accuracy under 2 procedures in adults with mental retardation. In the trial-unique procedure, every trial in a session contained different stimuli. Thus, comparison stimuli that were correct on one trial were never incorrect on other trials in that session (or vice versa). In the 2-sample DMTS procedure, the same 2 comparison stimuli were presented on each trial, and their function changed quasi-randomly across trials conditional upon the sample stimulus. Across 2 experiments, 7 of 8 subjects showed the highest overall accuracy under the trial-unique procedure, and no subject showed consistently higher accuracy under the 2-sample procedure. Negative, exponential decay functions fit to logit p values showed that this difference was due largely to the steeper delay-mediated decline in sample control for the 2-sample procedure. Stimulus-control analyses indicated that, under the 2-sample procedure, the selection of the comparison stimulus on Trial N was often controlled by the comparison stimulus selection on Trial N-1 rather than the Trial-N sample stimulus. This source of competing stimulus control is not present in trial-unique procedures. Experiment 2 manipulated intertrial interval duration. There was a small but consistent increase in accuracy as a function of intertrial interval duration under the 2-sample procedure, but not under the trial-unique procedure.  相似文献   

    

Liang B  Tracy AJ  Taylor CA  Williams LM 《American journal of community psychology》2002,30(2):271-288

Despite the popularity of mentoring programs, the relational dimension of mentoring has not been elucidated. Traditional conceptions of mentoring may exclude factors that are particularly important for women and girls, thus limiting the efficacy of mentoring programs for female adolescents. We suggest that the presence of relational qualities in the mentoring relationship (e.g., empathy, engagement, authenticity, and empowerment) strongly influences the success of mentoring in the lives of young women. In this study, we use a promising new measure of mentoring, the Relational Health Index – Mentor, to explore the impact of relational aspects of mentoring in female college students. We found that mentoring relationships high in relational qualities were associated with higher self-esteem and less loneliness.  相似文献   

  总被引：3，自引：3，他引：0  

K A Lattal  A M Williams 《Journal of the experimental analysis of behavior》1997,67(1):131-143

The relation between body weight and responding established with unsignaled delayed reinforcement was investigated. In three experiments, naive rats were deprived to either 70%, 80%, or 90% of ad libitum weight and were then exposed to tandem variable-interval 15-s differential-reinforcement-of-other-behavior 30-s schedules. The tandem schedule defined a resetting unsignaled delay-of-reinforcement procedure. In the first experiment, speed of magazine training, acquisition of lever pressing, and final rate of lever pressing were related to body weight. In the next experiment, lever pressing was established and maintained in rats that were magazine trained at 70% of ad libitum weight but that were then exposed to the delay procedure at 90% of ad libitum weight. Responding did not change consistently either across or within subjects in subsequent conditions in which body weight was manipulated. In the final experiment, lever pressing was established and maintained with delayed reinforcement in the absence of magazine training for each of 2 rats at 70% and for 1 of 2 rats at 90% of ad libitum weight. The results further illuminate the conditions under which responding can be established in the absence of training and when such responses are reinforced only following an unsignaled delay period.  相似文献   

    

Williams B 《Journal of the experimental analysis of behavior》1997,68(1):133-141

The phenomenon of contrast has been studied from two quite separate perspectives, one derived from the classic studies of incentive contrast such as Crespi (1942) and the other from the study of behavioral contrast within behavior analysis. This book reviews both of these types of contrast effects and finds both differences and similarities between them. Still at issue is the validity of the interpretation of contrast that assumes that the value of some target level of reward is modified in inverse relation to the level of reward from other sources in the same context. This concept works well for the classic studies of incentive contrast, but is challenged by the emerging importance of anticipatory contrast and the finding in both of the separate research traditions that anticipatory contrast is inversely related to other measures of reinforcement value.  相似文献   

WHAT IS LEARNED? REVISITING AN OLD ISSUE   总被引：1，自引：1，他引：0  

Williams B 《Journal of the experimental analysis of behavior》1997,67(2):255-258

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Sunyna S. Williams 《Journal of applied social psychology》2001,31(11):2322-2338

The current investigation examined the extent and nature of sexual lying in close and casual relationships. Participants were 790 undergraduates recruited from 2 institutions for 1 of 4 studies employing diverse methods—2 experiments, 4 surveys, and a recalled event. Participants tended to tell fewer sexual lies in closer relationships, and those lies tended to be relatively more other‐protective than self‐protective. Also, the more they engaged in sexual lying, the more sexual lying they believed their partners engaged in. Furthermore, individual sexual lying tendencies were consistent across situations. Finally, participants were generally quite honest with their sex partners, and they lied less about risk‐relevant sexual issues than about risk‐irrelevant matters. These findings have implications for safer sex interventions.  相似文献   

    

B A Williams 《Journal of the experimental analysis of behavior》2001,75(3):362-378

Traditional two-factor theory is supported by parallels in the clinical literature. Theoretical problems with two-factor theory are obviated by the role of safety signals, which serve as positive conditioned reinforcers and retard the extinction of conditioned fear.  相似文献   

    

Bryant Williams 《Journal of counseling and development : JCD》2003,81(3):370-374

A recent article, “Rethinking Individualism and Collectivism: Evaluation of Theoretical Assumptions and Meta‐Analyses” (D. Oyserman, H. M. Coon, & M. Kemmelmeier, 2002), revealed that 170 studies have been conducted on the worldview dimensions of individualism and collectivism. The authors' analyses of the studies provided empirical support for the theoretical notion posited by numerous multicultural counseling scholars, which outlines the importance of understanding worldview for competent practice. This article reviews the results of the authors' analyses and discusses the implications for counseling.  相似文献