The force/force-variability relationship under controlled temporal conditions

Previously, an inverted U relationship between force and force variability was demonstrated in both static and dynamic responses. Recent research suggests that the inverted U function may be due to a lack of control of the temporal aspects of the response. To investigate this hypothesis, we examined the relationship between force and force variability in rapid movements under controlled temporal conditions. Subjects (N = 4) made rapid reversal responses with a horizontal lever (using elbow flexion and extension) such that the time to reversal (160 ms) and the distance to reversal (45 degrees ) were held constant in each of six load conditions (either 0,.260,.780, 1.040, or 1.560 kg added to the lever). When time to reversal and time to peak acceleration were held constant, a curvilinear relationship between force and force variability resulted, suggesting that the inverted U function is related to control of the temporal aspects of the response.     

A complementary—Empowering model of ministerial leadership

Conclusion In conclusion, we suggest that both contemporary leadership effectiveness theory and a Biblical view of leadership empowering point to what we have called a complementary-empowering model of ministerial leadership. The varying levels of maturity to be found in any congregation require an adaptable leadership style that addresses each member of the congregation at his/her level of maturity and empowers that person for ministry and leadership in the church and community. The skills needed to lead persons at each of the maturity levels are not always given to every minister, thus the complementarity of the Body of Christ provides a variety of gifted leaders who together can empower believers for lives of service to the Body and ministry in the community.     

The existence and role of retinotopic and spatiotopic forms of visual persistence

Current theoretical conceptualizations of visual persistence fail to address the issue of its functional role. Based on extant experimental data we tentatively identify two general types of visual persistence: one resides in activity along the afferent visual pathway and is retinotopically organized; the other resides at central levels and is spatiotopically organized. Moreover, whereas the former afferent persistence is eliminated via saccadic suppression mechanisms in order to separate successive, retinotopic frames of pattern information, the latter, central one, in contrast, is generated and enhanced via extraretinal signals accompanying saccades in order to preserve phenomenal continuity of a stable spatiotopic representation of the environment from one fixation to the next.     

Attributions for Exam Performance

The expectancy confirmation and egotism approaches to attributions in achievement settings are contrasted in this study. It was found that students in two psychology classes expected to do well on their exams and that these expectations were based on internal factors (ability, effort). Post-test attributions were determined almost entirely by the simple valence of the outcome (success-failure). High outcomes were associated with internal attributions and low outcomes were associated with external attributions. It appears that students who perform poorly avoid the blame for failure by making ego-defensive external attributions and that these attributions enable them to make unreasonably high predictions for future performance. Some limited support was found for the notion that attribution may be affected by the degree to which outcomes confirm or disconfirm expectations.     

Premarital counseling: Approaches,objectives, content,and evaluation—a bibliography

A major problem for the premarital counselor is that the literature in the field is scattered throughout numerous journals and books representing several disciplines. Since counselors tend to subscribe to and read the literature from their own academic discipline, they may be unaware of what is being written elsewhere. This article contains a bibliography of what the authors consider to be the most relevant books and articles on premarital counseling published by the various disciplines. For the convenience of the reader, each listing is also coded as to its content.The authors express their appreciation to Charles R. Figley, Ph.D., Douglas H. Sprenkle, Ph.D., and Diane Spencer, M.S., for their assistance in the preparation of this paper. The valuable assistance of those contributors who notified the authors of their publications is gratefully acknowledged.     

Modified group therapy for psychotic and depressed patients

This paper describes a group treatment program for chronically ill patients which has been found to be more economical than traditional modalities of treatment of such patients and to minimize transference and countertransference problems. Technical guidelines and the theoretical rationale are discussed, as are the therapeutic factors in such a group. Case vignettes are given to illustrate both the group process and the individual patient's use of the group.The authors are deeply grateful to the residents of the department who, as cotherapists, shared in the planning and work of the coffee lounge groups. Invaluable to us also were the interest and ideas of Dr. Donald Miller who served as a consultant to this project.This is a revised version of a paper presented at Grand Rounds, Montefiore Hospital and Medical Center, Bronx, N.Y. in September, 1975.Miss Emery is, and Mrs. Levitan was, a social worker at Montefiore Hospital and Medical Center, Bronx, N.Y. Mrs. Levitan was formerly Principal Associate in Psychiatry (Social Work), Albert Einstein College of Medicine. Dr. Gadlin is Director of the Group Therapy Training Program at Montefiore Hospital and Medical Center, and Assistant Professor, Albert Einstein College of Medicine.     

The Marital Communication Rating Schedule: An instrument for clinical assessment

The Marital Communication Rating Schedule (MCRaS) is presented as an observationally based clinical rating system for assessing verbal behavior in marital communication. Data from 35 response display discussions lasting from 20 to 30 min each, which took place between 11 married couples, were used to examine aspects of the reliability and validity of the instrument. Three raters made independent ratings of 37 MCRaS categories for each husband and wife for each discussion period. Reliability among the raters was shown to be high when calculated within one scale point. Concurrent validity was assessed by comparing MCRaS ratings for four categories with observationally based validation criteria independently coded and measured. Results indicated that for three categories — negative statements, overgeneralizations, and amount of talk — ratings produced results that were similar to those yielded by laborious coding of audiotapes. For one category, opinions requested, a relationship between the ratings and coded data was not found. The validation results were discussed in terms of possible differences in the basis of ratings for the categories subjected to validation. Although further research is needed, it was concluded that MCRaS has many of the desirable qualities needed in a clinically useful, observationally based rating system.This investigation was conducted in connection with the Sociobehavioral Research Project at The University of Michigan when Joyce Borkin and Claude L. Walter were affiliated with the project.     

A programmable circuit for varying light intensity

An inexpensive circuit is described for the control of light intensity. The control is obtained by a method that produces no color changes and may be programmed by any system that can express itself in four-digit binary numbers.     

Relative motion and the adjacency principle

The perception of motion of physically moving points of light was investigated in terms of the distinction between absolute and relative motion cues and the change in the effectiveness of the latter as a function of the frontoparallel separation between the points. In situations in which two competing relative motion cues were available to determine the perceived path of motion of a point of light, it was found that the relative motion cue between more adjacent points was more effective than the relative motion cue between more separated points. In situations in which only one relative motion cue was available to determine the perceived motion of a point it was found that the effectiveness of this cue as compared with the absolute motion cue decreased with increased separation. These results are predictable from the adjacency principle which states that the effectiveness of cues between objects is an inverse function of object separation. Some consequences of the study for the theory of motion perception are discussed.