Motion parallel to line orientation: disambiguation of motion percepts

Four experiments demonstrate that lines indicating path of movement can generate rotational percepts in a multistable motion display that usually produces only horizontal or vertical motion percepts. The properties of the path-of-movement lines are predicted by a neural-network theory of visual perception. Experimental results validate the theory's predictions by demonstrating that movement of the display elements seems to follow an increasing luminance gradient in lines but not bars, and that illusory contours have similar effects. Experimental results also demonstrate that, in a choice between movement along lines drawn parallel or orthogonal to possible motion paths, observers more often see movement along the lines parallel to the motion path. These results suggest modifications to current computational and neurophysiological theories of motion perception.     

Effects of anger management and goal setting group interventions on state-trait anger and self-efficacy beliefs among high risk adolescents

In this study we evaluated the effects of two psychoeducational groups (anger management and goal setting) on state and trait anger, anger expression, and on self-efficacy beliefs of high risk adolescents enrolled in an alternative high school. Participants (n = 57) were pre- and post-tested using the State Trait Anger Expression Inventory (STAXI) with subscales for (a) state anger, (b) trait anger, and (c) anger expression, and on a measure of self-efficacy related to (a) anger management, (b) goal setting, and (c) group behavior and interpersonal communication. We hypothesized that each treatment would favorably impact the self-efficacy items related to it, that participants in both treatment groups would show gains in self-efficacy for general group behavior and communication skills, and that the anger management treatment would decrease state anger and anger expression. Results of a series of Repeated Measures ANOVAS revealed no group effects or group by time interaction effects. Analysis of Cohen's d effect sizes for the treatment groups in comparison with the control condition indicated only small treatment effects for the goal setting group on the STAXI, and small, negative treatment effects for the anger management group on the STAXI and on state anger. Thus, results failed to support the hypotheses with the current data set. Limitations of this study and implications for future research and group practice within schools are discussed. The authors thank Ellen Hawley McWhirter, Greg Sandstrom, and the administration, faculty, and students of the participating “alternative high school” for their help and support.     

Using nonlinear regression to estimate parameters of dark adaptation

An objective technique for estimating the kinetics of dark adaptation is presented, with which one can evaluate models with multiple parameters, evaluate several models of dark adaptation simultaneously, and rapidly analyze large data sets. Another advantage is the ability to simultaneously estimate transition times and rates of sensitivity recovery. Finally, this nonlinear regression technique does not require that the distributional properties of the data be transformed, and thus, parameter estimates are in meaningful units and reflect the actual rate of recovery of sensitivity.     

A Comparison of the Influence of Conflictual and Supportive Social Interactions on Psychological Distress

Following a quantitative review examining the relative influence of positive and negative social exchanges on emotional health, a second-order factor model of negative social exchange was tested and supported in a sample of 906 college students. Structural equation analysis exploring the unique effects of negative social exchange and perceived support satisfaction on depression revealed both variables to predict this outcome, over and above the contribution of personality and coping variables. In addition to the direct effects of the Big Five personality dimensions on depression, indirect effects of the Big Five via negative social exchange, support satisfaction, and avoidant coping also were observed. Although the prevailing belief among support researchers is that the negative effects of conflictual social interactions outweigh the positive effects of social support, the results of the quantitative review suggest boundary conditions that qualify this conclusion. In addition to corroborating a hierarchical measurement model of negative social exchange, the results of the present investigation suggest that how social support and social negativity are measured substantially influences conclusions concerning their relative impact on psychological distress.     

Decoding deficits and social competency: A continuous rating approach

Males who self-reported heterosocial difficulties and whose performance in a role-played interaction was judged to be of low social competence were compared to high-competent males on a continuous rating task. The rating task required that subjects make continual, ongoing social competency ratings of their own and six other males' performance in a role-play situation. The continuous measurement of performance provided a profile of ratings that was compared on frequency, latency-to-first ratings, profile elevation or level, scatter, and patterning. Low-competent males had longer latencies-to-first ratings than high-competent males and less scatter in their continuous ratings than did the high-competent group. The reduced scatter effect for continuous ratings replicates previous work done with global ratings and suggests that the low-competent group may not be able to discriminate among social stimuli as well as the high-competent group. The research also suggests that the continuous rating methodology may hold promise as a tool to investigate social perception processes.     

More on parts in object concepts: Response to Tversky and Hemenway

This articleresponds to the comments ofTversky and Hemenway (1991), who criticized the logic, stimuli, and data analysis of Murphy (1991). It is argued here that their objections do not mitigate the conclusions drawn by Murphy. In particular, the objection that the stimuli were not natural enough to reveal differences between category levels seems to presuppose an answer to the question under investigation. However, further experimentation with other stimuli might resolve this issue empirically.     

Parts in object concepts: Experiments with artificial categories

Previous research has demonstrated that basic-level categories are associated with the parts of objects. Five experiments were conducted to investigate whether this correlation is caused by a psychological principle that requires basic concepts to have common parts. This hypothesis was investigated in the experiments by separating part and nonpart information in artificial categories. Basic-level structure was measured in two ways: as the level with the highest ratio of within-category similarity to between-category similarity, and as the level with the fastest categorization time in an object-identification task. The results revealed that basic-level structure could be found in categories that did not have parts in common. Furthermore, nonpart information, such as size, color, and texture, could both enhance the basic level and eliminate the basic-level advantage, depending on whether the nonpart information was consistent with or contradicted the part information. These results suggest that, psychologically, parts are neither necessary nor sufficient to form a basic level.     

The function of one-word mediators in the recall of word pairs

The problem of demonstrating that natural language mediators play a role in learning and are not epiphenomena resulting from learning is an important problem in cognitive learning theories. Using a cued-recall and a free-recall learning task, Ss were requested to add a one-word mediator to some of the pairs of concrete nouns presented, The mediated pairs were learned better than the control pairs in both tasks. Both words were recalled only when the mediator was also recalled. Also, one-word mediators were the most effective recall cues and were the best recalled words in free recall. A two-stage learning model adequately described the data. However, a counterargument can be made which considers the mediator to be a high associate of one of the words presented and actually has no direct link to the other presented word. A possible experimental resolution of the problem is discussed.     

Effects of modality preferences on learning and recall of bisensory stimuli

The performance of visual attenders and aural attenders, as defined by performance on a bisensory digit-span task, was compared on three bisensory tasks. First, in replication of an earlier study, performance was compared on a bisensory missing-unit paradigm, in which S was required to respond with missing units from two independent sets of stimuli, each set being presented on a separate channel. The results corroborated those of an earlier study in which an interaction between modality preferences and presentation modality was found. Further, differential recall patterns were found for each of the groups. While such comparable results were not found on the other two tasks, differential performance on a bisensory paired-associate task and a bisensory connected discourse task were found. The results are interpreted in accord with Murdock’s (1967) hypotheses concerning separate sensory storage mechanisms.