Age, exercise, and coding performance

We investigated the effects of exercise on the coding performance of young and older subjects. Hypotheses were tested that exercise either facilitates spatial localization or reduces susceptibility to distraction in older subjects. In a balanced design, we administered Digit Symbol and Symbol Digit coding tasks to exercisers and nonexercisers at two age levels under conditions of low or high within-task interference. The findings showed higher performance by the exercisers than by the nonexercisers only at the older age level and only with the Symbol Digit task. These findings support the hypothesis that exercise compensates for a loss of spatial localization skills with age. We found no evidence that susceptibility to distraction either increased with age or was affected by chronic exercise.     

Memory performance after arousal from different sleep stages.

Learning material was presented to independent groups of subjects either after arousal from non-Rapid Eye Movement (non-REM) sleep, after arousal from REM sleep, or under conditions of no prior sleep. Measures of immediate and subsequent free recall were taken. Memory performance was found to be impaired where learning took place after non-REM arousal. This was manifest in the number of categories recalled, over both immediate and subsequent recall, and in the number of items recalled per category over subsequent recall. It was suggested that the memory performance decrement after non-REM arousal may be understood in terms of a retrieval deficit as well as a coding deficit. It is possible that the former is consequent upon a lower general level of arousal, whereas the latter is specific to memory.     

Quantitative depictions of threatening phenomena in news reports. The scary world of frequency data

Two experiments addressed the question of whether news reports depicting base‐rate data indicative of increasing population size over time would assuage the apprehension and victimization risk associated with another news story depicting frequency increases in a threatening phenomenon during the same time period. Men exposed to the population data manifested lower levels of apprehension and victimization risk than men not exposed to such data, but women showed no reduction in either apprehension and victimization risk than men not exposed to such data, but women showed no reduction in either apprehension or victimization risk after exposure to population data. This interaction was replicated in both experiments. Experiment 2 demonstrated that the same interaction can be produced using base‐rate data other than that depicting population increases over time and that the effects of the base‐rate stories are not merely a product of distraction from the threatening story. Differences in apprehension levels, information processing styles, mathematical problems solving skill, and sex role response sets were considered as alternative explanations for the interaction.     

Quasi-statistical inference in rating behavior I. Preliminary investigations

Bem and Allen (1974) have suggested that trait consistency-ratings can function as a moderator variable, with regard to the cross-situational validity of trait position-ratings. The present study attempts to consider the relationship between these two types of self-ratings. A model of “man the quasi-statistician” was proposed which yields the predictions that (a) consistency-ratings will vary positively with the polarization-estimate from position-ratings and (b) the extent of correlation will be a function of the degree of polarization associated with a given class of trait.In two experiments, position-ratings and consistency-ratings were obtained over a series of dimensions. The predictions were confirmed in both studies. In addition, Experiment II provided evidence for a correspondence between intuitive and formal estimates of central tendency polarization, although this was not the case for dispersion. The results were discussed as bearing on the model and as relating to the findings of Bem and Allen (1974).     

The association of racial attitudes and spiritual beliefs in post-apartheid South Africa

Previous research has investigated the complex association between religious beliefs and racism. Many studies have found that fundamentalist religious beliefs are positively associated with racial prejudice among European and European American populations. However, few studies have examined whether this association is found in other cultures or whether the association also characterizes spiritual beliefs. Data from 493 South African university students from three racial backgrounds revealed significant differences among the groups. A positive association between fundamentalism and racial prejudice was found among participants, but general spiritual beliefs were negatively associated with racist attitudes. The results emphasize the need to address contextual factors that influence the association between religious beliefs and racism within a given culture.     

Human Values and Social Identities among Samples of White and Black South Africans

We examined the value correlates of different social identities among two groups of South Africans, those identifying themselves as white Afrikaners or as black South Africans. Respondents indicated the importance of their membership of different groups and also completed indices of National strength and order, and International harmony and equality. Multiple regression analyses showed that the social identities associated with both values for self‐identified Afrikaners were mainly linked with ethnic language (Afrikaans) and religion. Among self‐identified black South Africans, however, the social identities were more encompassing, including the notion of global citizen and South African. The findings are discussed in the light of ongoing political and social change in South Africa and the nature of changing identities, as well as the role of cultural symbols in facilitating in‐group identification among white Afrikaners.