P-SPACE: A program for simulating spatial behavior in small groups

P-SPACE is a computer program that simulates spatial behavior in a small group of individuals. The program describes how interpersonal distances change through time as a result of changes in microlevel features, such as the minimization of local dissatisfaction. Agents are located in a two-dimensional lattice and can move some discrete space units at each discrete time unit within their neighborhood. A nonsymmetrical matrix of ideal distances between agents must be specified. Agents move in order to minimize their dissatisfaction, defined as a function of the discrepancy between possible future distances and ideal distances between agents. At each iteration, agents will move to those cells in their neighborhoods for which the function is minimized. Depending on the specific values in the ideal-distance matrix, different kinds of social dynamics can be simulated.     

Alcohol and previous acquaintance: Mood and social interactions in small groups

The effects of alcohol (0.75 g/kg) on qualitative and quantitative aspects of verbal interaction and self-reported mood were studied in small groups of either strangers or acquaintances. Four groups consisting of two male and two female subjects were observed during discussion of a film topic. Significantly more verbal activity was observed as a function of alcohol ( p <0.01), consistent with self-reported euphoria, affiliative moods, and reduced social anxiety. Bales IPA data indicated that more negative emotions were expressed ( p <0.05) and more assertive communications were delivered as part of the generally increased verbal activity under alcohol conditions. Although alcohol and previous acquaintance tended to alter mood ratings in similar ways, alcohol was clearly the more powerful agent. Alcohol increased both total verbal activity and the output of more self-disclosing or provoking verbal responses. Although acquaintance alone had neither of these effects, it tended to promote the increase in verbal activity produced by alcohol.     

A pseudoperceptual display system for investigating human statistical decision processes

A CRO display system is described in which a random sequence of dots appears on the CRO derived from a Gaussian distribution with a specified mean and standard deviation. Os are required to make judgments about the statistical parameters of the distributions.     

Understanding environments: The key to improving social processes and program outcomes

The contributions to this Special Issue illustrate research on several important types of environmental units, including psychiatric and substance abuse treatment programs, neighborhood block groups, and entire communities. They also exemplify alternative methodologies, such as assessing environments by relying on participants' appraisals, external observers' ratings, historical archives, and direct observation. I draw on these contributions and some of my own work to discuss four recurrent issues: (a) how to conceptualize environmental domains and dimensions; (b) how to understand environmental dynamics, that is, the interplay of environmental factors both within one setting and across settings; (c) how to comprehend the processes that link environmental factors to outcomes, especially with respect to the power and evanescence of environmental influence; and (d) how to use information about environments to monitor and improve them. Increased knowledge in these four areas is essential to help fulfill a major aim of community psychology: to understand social processes and improve intervention program outcomes.     

School-based discussion groups for children of divorce: A pilot program

This paper describes a pilot program for school-based discussion groups for children of divorce. Relevant literature is reviewed and a model for a semistructured discussion group for latency-aged children is presented. Particular techniques used to engage children in discussion of relevant issues are described. While we have not conducted a systematic outcome study of these groups, our impression is that while some definite concrete changes have occurred for several children, for others, change has been located more in the representational than behavioral world. Children may remain unable to communicate angry feelings to the absent parent but as a result of the group experiences may be able to stop thinking of themselves as bad for harboring such feelings in the first place.Formerly an Elementary Guidance Counselor in the Brookline Public Schools, currently is an Educational Consultant in the Philadelphia area.     

Fractional Design Wizard: A computer program for cost-effective experimental research design

The computer program Fractional Design Wizard creates fractional factorial designs that are cost-effective and especially useful for discarding irrelevant factors from a large number of possible candidates. The program is intended for researchers who are relativelynew to the field of fractional design and who want to acquaint themselves with the use of fractions for the reduction of large experimental designs. Fractional designs allow estimation of main effects, and sometimes two-way interactions, without one’s having to examine all treatment conditions. The program needs Microsoft Windows 95 or better and 32 MB of memory. In a step-by-step fashion, the user can specify the required properties of the fractional design. When there are more valid designs, the user can generate these successively If necessary the user can go back to diminish the requirements. The output can be copied, printed, and saved. The program generates all the information that is needed for the use and interpretation of fractional designs. A help file explains the use of the program and also the purpose, the analysis, and the interpretation of fractional designs. The program, which is written in Object Pascal, is available as freeware on www.fss.uu.nl/ms/hl/fracdes.htm.