Acquisition and extinction of a simple motor skill as a function of delay of knowledge of results

The present experiment demonstrates that the effects of delay of knowledge of results (KR) in a line drawing task depend upon the dependent variable which is considered and the original response tendency of the subjects. Delay of KR interfered with the acquisition of the correct response when number of correct responses is the dependent variable. When KR was omitted the immediate-KR group continued to make more correct responses than the delayed-KR group. However, there was a significant reduction in correct responses for both groups. When absolute error was the response measure there were no significant differences between immediate-and delayed-KR groups either during acquisition or extinction. Analysis of the type of response made during extinction suggested that the overshooting effect obtained by previous investigators may be typical of short responders trained under conditions of immediate reinforcement but not of those trained under delayed-KR.

Greenspoon and Foreman (1956) obtained clear cut evidence that the effectiveness of knowledge of results (KR) in a line drawing task varies inversely with the time delay between the response and KR. On the other hand, Bilodeau and Bilodeau (1958) were unable to demonstrate a similar effect in five different experiments. Bilodeau and Ryan (1960) hypothesized that the Greenspoon and Foreman findings could not be replicated and they did in fact obtain null results. However, Dyal (1965) has recently replicated the Greenspoon and Foreman results for the case of a 30 sec. delay interval.

The purpose of the present experiment is twofold: (a) to provide replication of Green-spoon and Foreman's study at the 20 sec. delay interval used by Bilodeau and Ryan, and (b) to determine the effect of elimination of KR on a simple motor response which has been formed on the basis of KR.     

THE CATEGORY SCALE EQUATION

It has been claimed that the nearly logarithmic form of some category scales supports Fechner's law. However, by assuming that the concepts of similarity and difference are quantitatively complementary, it is possible to deduce the category scale equation from the similarity function. Thus, the category scale equation cannot be taken as evidence of the validity of Fechner's law.     

Diversity-Sensitive Counseling Today: A Postmodern Clash of Values

This article is the second in an ongoing series devoted to a critical reassessment of the status of diversity-sensitive counseling. The current discussion focuses on the use of existing counseling theories and interventions in a diversity-sensitive counseling context, and potential limitations of affirmative action in the American Counseling Association's organizational structure and in counselor preparation programs. Inconsistencies are noted between the strategies now being used to achieve diversity and the philosophical foundations of the counseling profession. At issue are the conflicting values of various constituencies within the Association.     

Publication Patterns of The Personnel and Guidance Journal/Journal of Counseling & Development: 1978 to 1993

The purposes of this study were (a) to identify the primary institutional sources of articles to The Personnel and Guidance Journal/Journal of Counseling & Development from 1978 to 1993 (Volumes 57–71); (b) to identify the primary individual contributors to this journal during the survey period; (c) to identify and compare the program affiliations of individual contributors by editor during the survey period; and (d) to speculate as to whether the study results, collectively, indicate a trend toward more psychologists than counselors contributing to this journal. A total of 1,843 articles were reviewed. Of the 2,198 authors, 69% were academicians and 31% were practitioners. The data suggest that there has been a clear pattern of more psychologists than counselors contributing to this journal.     

A computer program for automated scoring of exteroceptive suppression periods

Exteroceptive suppression (ES) of temporalis muscle activity has received recent attention as a method of investigating central mechanisms in the pathogenesis of chronic headache disorders. Unfortunately, the resolution of conflicting findings has been hampered by the use of different assessment and scoring methodologies across laboratories, which has limited the direct comparison of findings across studies. A computer program was developed with the goal of providing an automated and reliable method of scoring ES responses. Processing an ES response with this software provides both visual and quantitative information relating to various response parameters. Multiple levels of smoothing the raw waveform data are available, and the software offers scoring on the basis of multiple depth-of-suppression criteria. The program also generates values for a variety of ES parameters: latency, duration, area, maximum level of suppression with its corresponding time (msec), and baseline level of muscle activity. It is likely that a reliable and standardized scoring protocol would enhance comparability of ES data generated across different settings.     

An Anti-Molinist Argument

Philosophical Studies -     

A sequential analysis of the mother-adolescent interactions of ADHD,ADHD/ODD,and normal teenagers during neutral and conflict discussions

The sequential interactions of three groups of teenagers conversing with their mothers during both neutral and conflict discussion situations were evaluated. Groups consisted of (1) attention deficit hyperactivity disorder (ADHD) alone (n =21), (2) ADHD with comorbid oppositional defiant disorder (ADHD/ODD; n =40), and (3) a community control group of adolescents (n =49). All groups had been followed concurrently for the past 8 to 10 years before being reevaluated in this study. Results indicated that (1) teens and parents in all groups interacted in a tightly linked manner, with the behavior of each member being significantly related only to the immediate antecedent behavior of the other; (2) mothers in all groups were more likely than teens to initiate positive behaviors; (3) teen interactions could be characterized as tit-for-tat while mothers could be typified as be-nice-and-forgive; (4) mother-teen dyads in the ADHD/ODD group displayed significantly higher rates of conflict behaviors than dyads in the other two groups, who did not differ significantly from each other on most measures; and (5) mothers in the ADHD/ODD group responded in a manner similar to their teens (greater negativity) and less like that of mothers in the other groups. The majority of conflict between ADHD children and their parents seemed due to comorbid ODD and such ODD is a family, not just a teen, characteristic.