Individual differences in deductive reasoning

Three studies are reported, which examined individual differences in deductive reasoning as a function of intellectual ability and thinking style. Intellectual ability was a good predictor of logical performance on syllogisms, especially where there was a conflict between logic and believability. However, in the first two experiments there was no link between ability and performance on indicative selection tasks, in sharp contrast to previous research. This correlation did, however, return in the final study. Our data are consistent with the claim that the correlation with logical accuracy on abstract selection tasks is found primarily with participants of relatively high ability. At lower levels, pragmatically cued responses are given but those of slightly higher ability divorce the rule from the scenario and respond consistently (though incorrectly) across problems. Self-report questionnaires were generally poor predictors of performance, but a measure of the ability to generate alternative representations proved an excellent predictor. These results are consistent with a mental models approach to reasoning and also have implications for the debate about human rationality.     

Does Klein’s infinitism offer a response to Agrippa’s trilemma?

The regress of reasons threatens an epistemic agent’s right to claim that any beliefs are justified. In response, Peter Klein’s infinitism argues that an infinite series of supporting reasons of the right type not only is not vicious but can make for epistemic justification. In order to resist the sceptic, infinitism needs to provide reason to think that there is at least one justified belief in the world. Under an infinitist conception this involves showing that at least one belief is supported by an infinite series of supporting reasons. This paper argues that showing this makes problems for the infinitist. The finite minds problem that prevents completion of an infinite series is well documented. This paper examines alternative attempts to provide evidence of infinity that the infinitist might take, whether by using a notion of justification without infinite reasons or by altering the notion of evidence. It concludes that both of these fail and consequently infinitism is unable to offer a solution to Agrippa’s trilemma.     

Gender-role identity after heart attack: Links with sex and subjective health status

Abstract

This paper compares the health status of 60 women and 60 men six months after suffering a myocardial infarction. Findings confirm previous reports of women having a poorer outcome compared with men at this period of rehabilitation. However, using a measure of gender-role orientation, it was found that masculinity was a better discriminator of outcome measures than sex alone. Higher levels of masculinity were associated with better health status for both women and men. Femininity was not related to differences in health status but was related to age in the total patient sample. On the assumption that gender-role orientation is a portrayal by the individual rather than a trait, the argument is made that women and men display masculinity through different articulations of fitness. The better or worse outcomes following heart attack variously affect the ability of men and women to signify in gender terms.