Perceptual learning in visual category acquisition

The attribute structure of a set of dot patterns was studied by having subjects segment (parse) the dots of each pattern into parts or subunits by drawing circles around groups of dots from each pattern. These parsing data were obtained for subjects who had no prior experience with the patterns and for subjects who had previously learned to identify the patterns as members of one of four categories. Analyses of the parsing data indicated that category learning increased the salience of large subunits that were similar in orientation for patterns that were members of the same category. This evidence for perceptual learning was obtained even when the category training procedure required learning to identify the patterns individually, suggesting that attribute abstraction and item learning are not incompatible. It was also obtained without an increase in overall intersubject agreement. The latter result led us to question the usefulness of intersubject agreement as an index of category knowledge.     

Why women fail/succeed in ministry: Psychological factors

A study was made of the most and least successful women minister graduates of Christian Theological Seminary since 1959. Significant differences were found in several scales of the CTMM, the ACL and the MMPI. These indicated, for example, higher intelligence, a better self-image, more openness to feelings and to general human faults plus alternative viewpoints, more leadership ability and ability to take charge of their own lives, for the more successful women. Implications for helpful interventions were discussed.Dr. Cardwell is Assistant Professor of Psychology and Counseling and Director of the Pastoral Counseling Service at Christian Theological Seminary, 1000 West 42nd Street, Indianapolis, Indiana 46208.     

The perception of briefly exposed point-sources of light

Point-sources of light (dots) were exposed for 10 to 50 msec, before five dark-adapted subjects in a dimly illuminated room. During voluntary fixation with one eye, the target was exposed some 10° on the nasal side of the optic axis. The intensity X duration of all targets was 2 X threshold and they consisted of either a single dot, or a pair of dots separated by a distance that was less than that required for two-point discrimination. In two-thirds of trials both the single-dot and the two-dot targets were perceived as short thin lines of various orientation. Although individual percepts were unpredictable, there was a preferred or most likely orientation for responses to the single-dot target; this was near to the horizontal for all five subjects. There was no significant difference between the preferred orientations for single-dot targets tested at sites more than 1° apart in the visual field. When two single-dot targets, separated by about 1°, were exposed simultaneously, the orientations of the perceived lines sometimes differed by as much as 80°; occasionally, one target was reported as a dot while the other was seen as a thin line. If the single-dot was briefly exposed between two continuously visible and parallel straight lines, the target usually appeared as a thin line, parallel to the framing lines. Some of these results appear to be consistent with the hypothesis that the human visual cortex, like that of the cat and monkey, contains neurones that are orientation specific.     

Youth Suicide Prevention: A Survey and Analysis of Policies and Efforts in the 50 States

State-level initiatives directed at youth suicide prevention since 1980 were analyzed. During 1992 and 1996, each governor was surveyed regarding his or her state's efforts in youth suicide prevention. Questions pertained to legislation, a mandated or recommended school-based suicide prevention curriculum, funding, a special advisory council, a state plan, the development and dissemination of materials, and assessment. Several states sent examples of their prevention activities, which were reviewed to determine the extent to which they represent conceptually and/or empirically grounded preventive intervention strategies. The number of suicides, suicide rates, and percentage change in rate for youth 15–19 years old were reported by state for the periods 1979–1981 and 1992–1994. The results of a repeated measures 2 × 5 ANOVA revealed that while changes in suicide rates over time were statistically significant, there was no relation between these changes and any of the variables studied. Suggestions for future research on state-level initiatives are presented.