Distance estimation in a dynamic simulated environment: a visual field dependence problem?

Egocentric distance estimation implies that the subject perceives his own location in the environment. In a simulated environment, subjects have to transpose perceptively their own observation point in order to assume their virtual body position. As only visual information specifies this position, their ability to perceive the camera viewpoint should be linked to the field dependence independence factor (FDI). Field-independent subjects underestimated the mid-distance between their own virtual body position and a far-located target; their bisection was located between the projective (2-D) and the simulated (3-D) mid-distance which indicates their difficulty in considering the in-depth simulated spatial references. High correlations between the vertical estimation in the rod-and-frame test and the egocentric-distance-estimation task (with shifted camera) suggest a similar perceptive process in both tasks. This result is confirmed by the better performances of the field-dependent subjects in this condition. In conclusion, we discuss the relationship between FDI and the sense of presence in virtual environments.     

The future of the American Group Psychotherapy Association: whither we goest?

The author describes his perspective about what the future holds for the American Group Psychotherapy Association (AGPA). Utilizing Nitsun's (1996) construct of the "anti-group" as an organizing metaphor, he delineates the destructive forces both within and outside the organization that are currently affecting it, and then describes how they can be transformed into instruments for positive development. He suggests that the AGPA can and must continue to provide a "holding environment" (Winnicott, 1960) for professionals interested in working with people in groups. In addition, he asserts that the organization will build upon its remarkable response to the September 11, 2001 debacle in the United States to expand its services to those who have been traumatized. Beyond this, he underscores the importance of the AGPA consolidating and expanding its various educational offerings into a coherent package that will meet the needs of any and all who are interested in learning about how to work effectively with groups. In these and other ways, he contends that the AGPA will thereby confirm Nitsun's assertion that anti-group forces can be transformed, and that organizations that confront these forces constructively can not only survive but thrive.     

An outcome management program for extending advances in choice research into choice opportunities for supported workers with severe multiple disabilities

We evaluated an outcome management program for increasing choice opportunities provided by 2 job coaches for 5 supported workers with severe multiple disabilities in a community job. The program involved specifying and monitoring behavioral outcomes among workers and staff, training staff, and supportive and corrective feedback. Increased choice provision occurred for both job coaches across a 1-year period. Results indicate how outcome management can help translate advances in choice research into routine practice.     

Instrumental and Pavlovian incentive processes have dissociable effects on components of a heterogeneous instrumental chain

Two experiments compared the effects of Pavlovian stimuli and incentive learning on the performance of a heterogeneous chain of instrumental actions. Using a Pavlovian-instrumental transfer design, the authors found that only a stimulus paired with the same outcome as that earned by performance of the chain produced positive transfer, an effect that was restricted to the action in the chain most proximal to reward delivery. In contrast, after a shift to a nondeprived state, only animals that had previously consumed the instrumental outcome when they were nondeprived decreased instrumental performance. Furthermore, this effect of the incentive learning treatment was limited to performance of the distal action. Together these data suggest that Pavlovian and instrumental incentive manipulations have dissociable effects on instrumental performance.     

Social behaviors as determined by different arrangements of social consequences: diffusion of responsibility effects with competition

According to a recently proposed synthesis, social loafing, social facilitation, and deindividuation can be viewed as different ways of arranging social consequences (B. Guerin, 1999). The effects of such arrangements have been measured in past research as productive output (social loafing and social facilitation) or as antinormative behaviors (deindividuation), but all 3 effects are manipulable by changing individual identifiability, evaluation, social identity, task difficulty, and presence in a group. The synthesis also predicted that these same variables would apply to other measures and other arrangements of social consequences. To this end, in the present 2 experiments, the author varied the arrangements for consequence diffusion in a competition situation by varying small and large competing groups and measured productive output and antinormative behaviors simultaneously. The 2 experiments showed social-consequence effects in competition situations with college students, giving further support for the social-consequence synthesis and the idea that the verbal naming of phenomena in social psychology is arbitrary.     

Influence of drafting during swimming on ratings of perceived exertion during a swim-to-cycle transition in well-trained triathletes

After the swim to cycle transition of a triathlon, perceived exertion (RPE) during cycling was higher than during a single cycling bout for 8 well-trained triathletes, but swimming in a drafting position led to lower RPE responses and energy cost of cycling than swimming alone.     

Evaluation of bizarre-idiosyncratic thinking scale as a measure of thought disorder in children and adolescents with severe psychiatric disorders

To investigate the prevalence of thought disorder and the possible appropriateness of the Bizarre-Idiosyncratic Thinking Scale for children and adolescents with severe psychiatric disorders, 96 child and adolescent inpatients and day hospital patients, ages 6 to 18 years, at a state psychiatric hospital were rated by review of retrospective records using Marengo and Harrow's 1986 Evaluation of Bizarre-Idiosyncratic Thinking Scale for the presence of thought disorder in the Thematic Apperception Test and Rorschach Inkblot Test responses. Although the Evaluation of Bizarre-Idiosyncratic Thinking Scale had not been previously used with children and adolescents, the analysis suggested possible indications of thought disorder in several diagnostic groups. No significant differences were found on the Rorschach between patients with Schizophrenia and Psychosis, Not Otherwise Specified and those with Attention Deficit Hyperactivity Disorder, Major Depression, and Conduct Disorder. On the basis of the Thinking Scale ratings, the Thematic Apperception Test responses showed significantly higher ratings of thought disorder for patients with Schizophrenia and Psychosis, Not Otherwise Specified. There was no general relation between thought disorder and age or IQ, but schizophrenic patients, aged 13 and older, had more thought disorder than schizophrenic patients who were younger than 13.