A mathematical theory of optical illusions and figural aftereffects

If it is assumed that spurious enhancement of receptive field excitations near the intersection of image lines on the retina contributes to the cortical determination of the geometry of two-dimensional figures, an equation based on the least-squares fit of data points to a straight line-can be obtained to represent theapparent line. Such a fit serves as anextreemum on the precision with which a data set can be represented by a straight line. The disparity between theapparent line and the actual line that occurs in the case of peripheral (and to a lesser degree in more central regions of the retina) vision is sufficient to produce the perceptual errors that occur in the Poggendorff, Hering, and Mueller-Lyer illusions. The magnitude of the Poggendorff illusion as a function of the line angle is derived and experimentally tested. Blakemore, Carpenter, and Georgeson’s (1970) experimental data on angle perception are shown to fit this same function. Theapparent curve is derived for the Hering illusion. The Mueller-Lyer illusion is found to be a variation of the Poggendorff illusion. The equations are further developed and used to derive Pollack’s (1958) experimental results on figural aftereffects. The results involve onlyone experimentally determined coefficient that can be evaluated, within the limits of experimental error, in terms of physiological data. The use of these concepts provides a foundation for the abstract modeling of the initial phases of the central nervous system data reduction processes, including receptive field structure, that is consistent with the physiological limitations of the retina as a source of visual data, as well as with the findings of Hubel and Wiesel (1962).     

Family therapy in treatment of the deaf: a case report.

Deaf patients with psychological problems have developmental handicaps and clinical characteristics that reduce the effectiveness of traditional modes of psychotherapy. Attempts have been made to utilize individual and group therapy, but family therapy has been largely overlooked as a method of alleviating problems of the deaf. Clinical and research writings provide us with rich insights into the family dynamics of the deaf. These data suggest to the authors that the problems of deaf individuals are largely related to family problems, and therefore merit a family orientation as the focus for treatment. This paper describes an attempt to apply family therapy with a range of deaf patients over a period of two years. From a review of their work, the authors conclude that family therapy can be effective, particularly in the treatment of deaf adolescents and children.     

Teaching self-control of study behavior

A self-control procedure to improve study habits was taught to 38 volunteer students at the University of New Mexico summer school. The program involved the utilization of stimulus control procedures, self-reinforcement and punishment, and the SQ3R method (Robinson, 1946) of studying. Ss receiving the lessons showed a significant gain in grade point average (G.P.A.) for the three semesters following the study over the two preceding semesters, when compared with those not receiving the lessons. This gain was not due to any change in University grading standards. No difference in G.P.A. gains was found between Ss who received and discussed the lessons in group meetings and those who simply received them individually in written form.     

A signal detection theory analysis of a category judgment experiment

A category-judgment experiment is the reported. Rating-scale judgments of loudness were made with five or eight intensity levels of a tone and with different frequencies of presentation of the stimuli. Obtained ROC curves for pairs of stimuli were judged to support application of signal-detection theory. However, certain common assumptions of the theory are called into question by the data. Discrimination was poorer when more categories were available. This is attributed to an increase in criterion variance with an increase in the number of criteria. The slope of the ROC curves for different stimulus pairs suggested that stimulus variance is neither constant nor does it necessarily increase with stimulus intensity It is argued that stimulus variance may depend upon the distribution of internal observations over all trials.     

Organizing knowledge syntheses: A taxonomy of literature reviews

A taxonomy of literature reviews in education and psychology is presented. The taxonomy categorizes reviews according to: (a) focus; (b) goal; (c) perspective; (d) coverage; (e) organization; and (f) audience. The seven winners of the American Educational Research Association’s Research Review Award are used to illustrate the taxonomy’s categories. Data on the reliability of taxonomy codings when applied by readers is presented. Results of a survey of review authors provides baseline data on how frequently different types of reviews appear in the education and psychology literature. How the taxonomy might help in judging the quality of literature reviews is discussed, along with more general standards for evaluating reviews.     

The effects of therapist turnover in a training clinic: The core group phenomenon

Group psychotherapy conducted in training settings presents the membership with a unique opportunity to experience and work through loss. This paper describes the potentially problematic influence of predictable therapist turnover in these clinical settings. The core group phenomenon which emerges as a function of this anticipatory grief is described, as are the dynamics of core group members who are particularly vulnerable to the comings and goings of therapists in training. Finally, the importance of therapist attention to the impact of the turnover process in group psychotherapy training programs is underscored.     

Couples psychotherapy group: Treatment of the married alcoholic

As part of an intramural research program of the National Institute of Alcohol Abuse and Alcoholism focused on the psychobiogenetics of familial alcoholism, a psychodynamically oriented married couples psychotherapy group was formed. Its purpose was to determine whether this modality could be utilized as an outpatient treatment approach to identify and modify interpersonal interactions that affect both drinking behavior and the quality of family and marital life. This paper, a clinical case report, presents follow-up data and disusses both themes that emerged in the therapy process and the usefulness of this modality in the treatment of the married alcoholic.She was formerly Chief, Unit of Family Studies, Laboratory of Clinical Studies, National Institute of Alcohol Abuse and Alcoholism (NIAAA).At the time this paper was written, she was a Research Social Worker, Laboratory, of Clinical Studies, NIAAA, Bethesda, Maryland.