Contrasting Acquisition-Focused and Performance-Focused Models of Acquired Behavior

What is encoded during a learning experience? In a learning situation, a training (acquisition) phase is often followed by a test phase. Acquisition-focused models (most associative models) emphasize information processing that occurs during training and assume that only summary statistics (associative values) are retained to influence behavior during testing. Performance-focused models (a k a "computational" models) emphasize information processing that occurs at test and often assume fairly comprehensive memory of prior experiences. In this article, we contrast these two families of models. We note that neither family can claim unique support from the various learning phenomena commonly cited as favoring one or the other position. Within each family, there are highly diverse models that preclude blanket generalizations. However, the acquisition-focused view that subjects retain only summary statistics suggests unrealistically impoverished memories relative to the fairly veridical memories that clearly are formed. But this oversimplifying assumption of acquisition-focused associative theories is exactly what has made them superior to performance-focused models to date in stimulating research.     

"SOME THINGS YOU LEARN AREN'T SO":

When interpreting an interaction in the analysis of variance (ANOVA), many active researchers (and, in turn, students) often Ignore the residuals defining the interaction Although this problem has been noted previously, a appears that many users of ANOVA remain uncertain about the proper understanding of interaction effects To clear up this problem, we review the way in which the ANOVA model enables us to take apart a table of group means or the individual measurements contributing to the means to reveal the underlying components We also show how (using only published data) to compute a contrast on the question that may be of primary interest and illustrate for interpreting tables of residuals We conclude with an exercise to check on students understanding of ANOVA and to encourage increased precision in the specification of research results     

Professional preparation of individuals who provide genetic counseling services

An unprecedented increase has occurred in demand for genetic counseling services during the current decade. This study examined the complex issue of who currently provides genetic counseling services and the professional preparation of these personnel. A self-administered questionnaire was mailed to 325 genetic counseling professionals in the southeastern United States who were members of the Southeast Regional Genetics Group (SERGG), National Society of Genetic Counselors, or American Society of Human Genetics States; 204 completed the questionnaire (63%). Seventy percent of respondents were female and 30% were male. Thirty percent of respondents held MD degrees; nine physicians held PhD degrees. Most physicians were male. Thirty-two percent of respondents held master's degrees in genetic counseling; five counselors held PhD degrees. Twenty-three percent of respondents were nurses; eight nurses held master's degrees. Three percent of respondents were social workers. Individuals with other degrees, such as an associate of science in medical technology and a doctoral degree in education, also provided genetic counseling. Genetic counseling typically involved a team effort, consisting mainly of physicians and genetic counselors. Most respondents reported college coursework in human genetics, supervised training, and seminar/workshop training. Thirty percent reported college coursework in counseling techniques, supervised training, and seminar/workshop training. Policy recommendations are offered concerning professional preparation of genetic counselors.     

Local crime as a natural hazard: Implications for understanding the relationship between disorder and fear of crime

Summary We have suggested the following: Local crimes and natural hazards share several objective similarities and similarities in how they are perceived. Although local crimes and natural hazards are clearly different in numerous respects, these points of analogy suggest that in several ways responses to local disorder may be similar to responses to hazards. If this is the case, processes used to explain how persons respond to disasters may help explain a recurrent puzzle in the responses to disorder literature: the loose linkages between local disorder levels and fear levels.Future research needs include developing a fuller understanding of how other contextual factors mediate or moderate the processes discussed here, how these processes are related to and may mediate behavioral responses to crime, and how these behaviors in turn influence perceptions. We have suggested here that anticrime behaviors may result in some disadaptation to the threat, thereby elevating fear, and have provided evidence to that effect. In addition it is important to ascertain how the points of analogy between crime as a natural hazard and crime as an environmental stressor may be melded to develop more insight than afforded by either perspective considered singly. The heuristic developed here suggests some additional considerations for policy makers involved in anticrime or fear reduction programs.Irv Altman, Paul Bell, Joan McCord, Aaron Podolefsky, and Carol Werner provided helpful and encouraging comments on earlier drafts.     

Single-trial free recall from temporal search sets in long-term memory

The notion that the primacy effect, which is found in single-trial free-recall experiments, is partly a function of a selective-search component (Shiffrin, 1970) is contingent upon the ability of subjects to retrieve information via a distinctive temporal cue. The beginning of a list may be such a cue which defines a restricted temporal search set within a list as a whole. To test this theory, a second list-half primacy effect was generated in some 26 “unrelated” words lists by associating one color with each word in the first list half and another color with each word in the second list half. As predicted by the two-process theory, retrieval of the words which were presented around the color shift was differentially facilitated as measured by the difference between the probabilities of recall and recognition at each serial position and as compared to that of lists where the color codes were randomly presented.