Posttraumatic stress disorder and retrospectively reported stressor exposure: a longitudinal prediction model

There has been recent concern about the degree to which posttraumatic stress disorder (PTSD) symptomatology influences reports of prior exposure to highly stressful life events. In this longitudinal study of 2,942 male and female Gulf War veterans, the authors documented change in stressor reporting across 2 occasions and the association between change and PTSD symptom severity. A regression-based cross-lagged analysis was used to examine the relationship between PTSD symptom severity and later reported stressor exposure. Shifts in reporting over time were modestly associated with PTSD symptom severity. The cross-lagged analysis revealed a marginal association between Time 1 PTSD symptom severity and Time 2 reported stressor exposure for men and suggested that later reports of stressor exposure are primarily accounted for by earlier reports and less so by earlier PTSD symptomatology.     

Memory and judgment: Availability versus explanation-based accounts

Two theories about the relationship between memory and decisions are examined. In an explanation-based model, the organization in memory of decision-relevant information determines decisions. In an availability model, the amount of information sampled from memory that supports competing decisions is crucial. In Experiment 1, subjects read evidence from a legal trial, made decisions, and provided free-recall data. Evidence presentation order was manipulated to produce differences in evidence coherence. When the prosecution evidence order was coherent, the subjects were more likely to choose guilty verdicts, and recall of prosecution evidence, relative to defense evidence, was greater. Thus, both evidence coherence and availability of information in memory could account for the basic findings. In Experiment 2, recall differences were eliminated as a function of evidence order. The results show that verdict effects favoring the more coherent prosecution evidence are obtained even when the relative amounts of prosecution and defense recall are equated across conditions.     

Locus of control and achievement in child psychiatric inpatients

The relationship between the Nowicki-Strickland Locus of Control Scale for Children (Nowicki & Strickland, 1973) and academic achievement was examined in a sample of 66 child psychiatric inpatients. Previous studies had suggested that this measure correlated with achievement in normal samples (Nowicki & Strickland, 1973) but not in populations of male juvenile offenders (Little & Kendall, 1978). The product-moment correlation between the Nowicki-Strickland Scale and the Peabody Individual Achievement Test was significant. However, when the effect of IQ was controlled for in a partial correlation, there was no significant correlation. Discussion focuses on the relationship between these results and other findings in the area of locus of control, intelligence, and achievement.     

Using Authorware Professional for developing courseware

This paper describes the use of Authorware Professional, an icon-based, object-oriented authoring system, to develop courseware and on-line experiments. Notable features include direct editability, facility with many response types, and built-in variables. Shortcomings include the difficulty of learning how to use the program, inability to present stimuli rapidly, the program’s linear development style, weak drawing tools, a lack of scroll bars for text, and some problems in the use of Authorware with other applications. Overall, the package is recommended for users with adequate resources.     

What Can 1 Million Trials Tell Us about Visual Search?

In a typical visual search experiment, observers look through a set of items for a designated target that may or may not be present. Reaction time (RT) is measured as a function of the number of items in the display (set size), and inferences about the underlying search processes are based on the slopes of the resulting RT × Set Size functions. Most search experiments involve 5 to 15 subjects performing a few hundred trials each. In this retrospective study, I examine results from 2,500 experimental sessions of a few hundred trials each (approximately 1 million total trials). These data represent a wide variety of search tasks. The resulting picture of human search behavior requires changes in our theories of visual search.     

Self-monitoring and sex as moderator variables in the statistical explanation of self-reported marijuana and alcohol use

Self-monitoring and sex are examined as likely moderators of some of the known effective predictors of self-reported use of marijuana and alcohol. The theory of self-monitoring implies that in comparisons between low and high self-monitors, dispositional predictors account for more of the variance in reported use among low self-monitors and environmental predictors account for more of the variance among high self-monitors. With the two classes of predictors established via principal-components analysis and with subgroups defined by scores on Snyder's Self-Monitoring Scale, data from 807 college students showed that self-monitoring does not affect the action of either dispositional or environmental predictors. Thus, the self-monitoring construct promises explanatory leverage that in these tests, the scale is not able to deliver. When subgroups are defined by sex, analyses of reported alcohol use yield small but significant moderator effects: Women's use is more predictable from environmental variables, whereas men's use is more predictable from dispositional variables. These effects are consistent with the conclusions of recent meta-analyses of results from studies of sex differences in conformity to group pressures.     

Parents' and preschool children's choices of disciplinary childrearing methods

Forty preschoolers individually were shown a videotape containing six 30-second scenes depicting common parent/child conflicts. The children were asked to tell the experimenter what they would do if they were the parent on the tape, and what their own parents would do if this happened at home. In addition, 15 mothers of these children were selected randomly to view the same scenes and to indicate their choice of conflict resolution methods. Taped responses of parents and children were then coded as verbal/physical coercion or no coercion. Results indicated that preschoolers tended to choose disciplinary actions in accordance with their perceptions of their parents' manner of dealing with the same situation, and also revealed a high congruence between parent and child on consequences for discipline. The implications of these findings are discussed in relation to the development of childrearing methods at an early age and the intergenerational transmission of family violence.