The Power of Many Small Sex Differences in Cognition, Personality, and Interests

Across 13 cognitive tasks and questionnaires (NF = 1465, NM = 1302), small sex differences in the expected directions combined to correctly classify individuals as male or female in 80% of cases and explained a substantial share of variance in real-life occupational gender segregation.

May 2026 · Agneta Herlitz, Joakim K. E. Frostegård, Martin Asperholm, Richard Bränström, Elizabeth Guest, Joakim Martinsen, Hedda Sonnegård, Kimmo Sorjonen, Lisa B. Thorell, Björn N. Persson
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Empathy and Universal Values Explicated by the Empathy-Altruism Hypothesis

In two studies, we examined whether emotional and cognitive empathy relate differentially to Schwartz’s universal values. Emotional empathy was strongly and positively related to altruistic values and accounted for up to 18% additional variance beyond the Big Five, whereas cognitive empathy did not, consistent with the empathy-altruism hypothesis.

March 2016 · Björn N. Persson, Petri J. Kajonius
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Hedonism, Achievement, and Power: Universal Values That Characterize the Dark Triad

Using a sample of Swedes and Americans (N = 385), we examined how Dark Triad traits relate to Schwartz’s 10 universal value types. Machiavellianism and narcissism were linked to Achievement and Power, and psychopathy to Hedonism and Power. The Dark Triad traits explained unique variance in social values beyond the Big Five.

January 2015 · Petri J. Kajonius, Björn N. Persson, Peter K. Jonason
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