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The Strength Of Sex Differences Of Human Behavior And Cognition

Decent Essays

Widespread gender stereotypes often assume vast psychological differences between males and females. This assumption is perhaps unsurprising as there are marked biological differences between the sexes and gender is one of our most salient characteristics (Macrae & Bodenhausen, 2000). The current essay explores what meta-analyses reveal about the strength of sex differences in human behaviour and cognition. Its structure is based on Cohen’s definitions for large (d=0.80), moderate (d=0.50) and small (d=0.20) effect sizes (as defined in Hyde, 2005). Methodological limitations are considered and it is concluded that meta-analyses reveal some large and moderate sex differences, but the majority seem to be small and/or context-dependent. …show more content…

One meta-analysis found that, on average, females smile more frequently than males (LaFrance, Paluc & Hecht, 2003). This sex difference was much larger when participants were aware of being observed (d=-0.46) than when they were not (d=-0.19). In addition, males appear to display moderately more physical aggression than females (d=+0.59) (Knight, Guthrie, Page & Fabes 2002). Several papers conclude that the strength of this sex difference is also context-dependent (Lightdale & Prentice, 1994; Archer, 2004), but the literature is currently lacking a comprehensive meta-analysis investigating precisely which contexts affect it and how. Furthermore, males appear to obtain higher scores on a sensation-seeking scale than females (Cross, De-Laine & Brown, 2013). This sex difference was much larger in 1978 (d=+0.48) than 2013 (d=+0.28), which may be due to changes in social norms or outdated measures (Cross, De-Laine & Brown, 2013). The uncertainty about how to interpret these results illustrates the importance of using context-relevant measures in this field. Together, these findings suggest that the magnitude of moderate sex differences are not always robust across contexts. Cross cultural studies, large population studies and studies utilising deindividuation designs are needed to investigate specific contexts that affect the strength of sex differences.
Small sex differences
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