Programs for visual psychophysics on the Amiga: A tutorial

A typical psychophysical experiment presents a sequence of visual stimuli to an observer and collects and stores the responses for later analysis. Although computers can speed up this process, paint programs that allow one to prepare visual stimuli without programming cannot read responses from the mouse or keyboard, whereas BASIC and other programming languages that allow one to collect and store observer’s responses unfortunately cannot handle prepainted pictures. A new programming language called The Director provides the best of both worlds. Its BASIC-like commands can manipulate prepainted pictures, read responses made with the mouse and keyboard, and save these on disk for later analysis. A dozen sample programs are provided.     

Cognitive mechanisms mediating the biasing effects of leader sex on ratings of leader behavior

The present study examined the effects of the sex of the leader, the sex of the rater, and the temporal position of leader performance information on ratings of leader behavior. Male and female subjects listened to an audiotape of a male or female leader and then rated the leader's initiating structure and consideration behaviors. The position of the leader performance information was manipulated by describing the leader as successful before or after raters listened to the audiotape or not presenting raters with the performance information. Analyses indicated that the sex of the leader and/or sex of the rater biased ratings of initiating structure when the performance information was presented after the audiotape and when no leader performance information was presented. Consideration ratings were affected only by the position of the leader performance information. The results are interpreted within a cognitive/implicit sex theory framework. Implications for leadership research are also discussed.Portions of the data analyzed in this study were collected by the second author as part of a master's thesis directed by Joseph A. Sgro.     

Separability and integrality of global and local levels of hierarchical patterns

We used a constrained classification task to examine the perceptual relations between global and local levels in hierarchical patterns composed of many, relatively small elements and those composed of few, relatively large elements. In Experiments 1 and 3 subjects were asked to make classifications based on "form" or "texture." In Experiments 2 and 4 they were asked to classify according to the "shape" of the configuration or the elements. The results indicate that configural and elemental levels are perceptually separable for many-element patterns when processed as form and texture: Subjects could attend to either level without being affected by variation along the irrelevant dimension. However, when the same many-element patterns were processed for global and local shape, subjects could not selectively attend to either level. For few-element patterns, global configuration and local elements appeared to be perceptually integral dimensions. These results are relevant to two issues: the global precedence hypothesis and the explanations of integral and separable dimensions.     

Children's assumptions about the generalizability of sex-typed abilities

Children (mean age = 103 months) were provided with information about the relative abilities of two stimulus children at a specific activity. They then were asked to predict which child would likely be superior at a second highly related activity. The two stimulus children were either same sex or opposite sex, and the activities in each pair were sex typed as male or female. The design was a 2 (sex of subject) × 2 (age of subject) × 4 (stimulus pair—MM, FF, MF, FM) × 2 (sex type of activities) mixed design, with sex of subject and age of subject as the between-subjects factors. Each child responded to 32 instances, representing four replications of eight possible combinations. The dependent variable was the child's choice of the initially superior child or initially inferior child as better at the second activity. The prediction was that children would be less likely to assume that superiority could generalize to a second activity if the initial superiority contradicted sexstereotyped expectations. This result would indicate that sex stereotypes interfere with inferences processes, supporting a scehmatic model of sex stereotyping. The results were consistent with the prediction. Compared to a baseline condition in which sex stereotypes were not relevant, children were less likely to choose the initially superior child when the sex stereotype had been violated, and more likely to select that child when it had been confirmed.     

Family crisis intervention: fish or fowl?

This paper considers the status of family intervention as an area of interest defined by its literature (70 publications) and includes a brief history, assessment of present status, and recommendations for future development of family crisis intervention as a distinct field with concepts and goals that can be clearly defined, taught, researched, and repeated in treatment. Recommendations are made for the development of an explicit paradigm for intervention with a clear, common language of terms and concepts for family involvement. Suggested directions for developing the paradigm and language are explored.     

Visual stimuli on the Commodore Amiga: A tutorial

The Commodore Amiga home microcomputer, together withDeLuxePaint, a commercial software package, can generate many useful visual stimuli, including random-dot stereograms, apparent motion, texture edges, aftereffects from dimming and brightening, motion aftereffects, dynamic random noise, and drifting and counterphase gratings. Videotapes can readily be made of these displays. No programming experience is necessary.