Process, not representation: reply to Radvansky (1999).

The size of fan effects is determined by processes at retrieval, not by whether or not information is represented as situations. Evidence contradicts G. A. Radvansky's (1999) claim that time to retrieve information from a situation does not depend on the number of elements in the situation. Moreover, Radvansky's principles for ascribing situational models to experiments appear to be post hoc ways of redescribing the data. On the other hand, the evidence does support the Adaptive Control of Thought--Rational (ACT-R) assumption that participants can adjust their attentional weightings and so produce differential fan effects. Moreover, the ACT-R theory of the fan effect is consistent with many other findings.     

Neuronal NT-3 Is not Required For Synaptic Transmission or Long-Term Potentiation in Area CA1 of the Adult Rat Hippocampus

Neurotrophic factors, including BDNF and NT-3, have been implicated in the regulation of synaptic transmission and plasticity. Previous attempts to analyze synaptic transmission and plasticity in mice lacking the NT-3 gene have been hampered by the early death of the NT-3 homozygous knockout animals. We have bypassed this problem by examining synaptic transmission in mice in which the NT-3 gene is deleted in neurons later in development, by crossing animals expressing the CRE recombinase driven by the synapsin I promoter to animals in which the NT-3 gene is floxed. We conducted blind field potential recordings at the Schaffer collateral–CA1 synapse in hippocampal slices from homozygous knockout and wild-type mice. We examined the following indices of synaptic transmission: (1) input-output relationship; (2) paired-pulse facilitation; (3) post-tetanic potentiation; and (4) long-term potentiation: induced by two different protocols: (a) two trains of 100-Hz stimulation and (b) theta burst stimulation. We found no difference between the knockout and wild-type mice in any of the above measurements. These results suggest that neuronal NT-3 does not play an essential role in normal synaptic transmission and some forms of plasticity in the mouse hippocampus.     

Form and content: looking at visual features of television.

Television viewing at home by 50 individuals in 5 age groups (2-, 5-, 8-, 12-year-olds, and adults) was recorded on 1-s time-lapse videotapes over 10-day periods. Coding was based on 5-min point samples. Analysis examined looking at the TV screen in relation to the visual presence of the features cuts, movement, animation, man, woman, child, and nonhuman; content features were child vs. adult programming and overt purposeful character behavior. Cuts, movement, and overt purposeful character behavior were positively related to looking independent of child vs. adult programming. Associations with looking for the remaining features depended on the viewer's age or sex or type of content within which they occurred.     

EXTENDING THE CONCEPT OF SOCIAL VALIDITY: BEHAVIOR ANALYSIS FOR DISEASE PREVENTION AND HEALTH PROMOTION

A broader definition of social validity is proposed wherein a socially valid behavior-change intervention is directed to a problem of verifiable importance, the intervention is valued and used appropriately by designated target groups, and the intervention as used has sufficient behavioral impact to substantially reduce the probability of the problem's occurrence in target populations. The verifiable importance of a problem is based on epidemiological data, and the value and appropriate use of an intervention are enhanced through the use of conceptual frameworks for social marketing and behavior change and considerable formative and pilot research. Behavioral impact is assessed through efficacy and effectiveness studies. Thus, the social validity of a behavior-change intervention is established through a number of interactive, a priori steps. This approach to defining social validity is related to critical analysis and intervention issues including individual and population perspectives and “top-down” and “bottom-up” approaches to intervention design. This broader definition of social validity is illustrated by a project to reduce the risk of HIV infection among adolescents. Although the various steps involved in creating socially valid interventions can be complicated, time-consuming, and expensive, following all the steps can result in interventions capable of improving a nation's health.     

Measuring the effectiveness of the Star Parenting Program with parents of young children

This study evaluated the effectiveness of the STAR Parenting Program, designed specifically for parents with children between the ages of 1 and 5 yr. The 8-hr. program was completed by 35 parents. There was a significant increase in parents' favorability and a significant decrease in anxiety afterwards. Parents also significantly lowered their expectations, reduced the emotionality of their reactions to their child's problem behaviors, and increased their use of time-out and tangible rewards following training. These changes were maintained at a 6-wk. follow-up.     

Conservatism and the comprehension of implausible text

An experiment on the comprehension of, and memory for, texts of varying degrees of plausibility is reported. Previous studies on conservatives' art preferences (concerning poetry and music) showed that they favoured works of art that were conventional and relatively simple; this was explained in terms of conservatives' generalised intolerance of ambiguity. The present study sought to extend the previous research by examining conservatives'and non-conservatives' memory of and preferences for texts of varying plausibility. When plausibility is disrupted, texts recount strange, unexpected and ambiguous sequences of actions and events. It was found that conservative subjects' memory for texts of varying plausibility was similar to that of non-conservatives when overall recall is considered, but there was a greater tendency for conservatives to import inferences (novel propositions which had not been present in the original text) into their recall protocols and to distort their recall (although the latter effect is only marginally significant). They also showed much stronger preferences for plausible over implausible texts compared to non-conservatives. These results accord well with the previous findings on art preferences, and were explained in terms of the conservatives seeking to avoid or minimise ambiguity.     

Coping with employment and family stress: Employment arrangement and gender differences

Increasing numbers of families in the United States are supported by two incomes. Families must cope with the changes this lifestyle brings. This study explored how women and men in various employment arrangements experienced and coped with stress. Data from 82 couples, analyzed separately by gender, suggest that women report significantly more stressors than men, whereas employment arrangement did not have an effect. All couples, however, seem to benefit by reframing their problems to make them more manageable. Perceptual changes families may make to cope with stresses imposed by external factors such as inflexible work hours and lack of adequate child care over which they have less control are discussed.This research was supported by grants from the Graduate Research Board and the Division of Human and Community Resources, University of Maryland, College Park.Acknowledgment is extended to the University of Maryland Computer Center and to Ms. Dell Karig, Ms. Kathleen Cohan, and Ms. Lisa Zelazny for their assistance on this project.