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Prenatal testosterone does not explain sex differences in spatial ability

Research output: Contribution to journalArticle

Teemu Toivainen, Giulia Pannini, Kostas A. Papageorgiou, Margherita Malanchini, Kaili Rimfeld, Nicholas Shakeshaft, Yulia Kovas

Original languageEnglish
Article number13653
JournalScientific Reports
Volume8
Issue number1
Early online date12 Sep 2018
DOIs
Publication statusPublished - 1 Dec 2018

King's Authors

Abstract

The most consistent sex differences in cognition are found for spatial ability, in which males, on average, outperform females. Utilizing a twin design, two studies have shown that females with male co-twins perform better than females with female co-twins on a mental rotation task. According to the Twin Testosterone Transfer hypothesis (TTT) this advantage is due to in-uterine transmission of testosterone from males to females. The present study tested the TTT across 14 different spatial ability measures, including mental rotation tasks, in a large sample of 19–21-year-old twins. Males performed significantly better than females on all spatial tasks, with effect sizes ranging from η2 = 0.02 to η2 = 0.16. Females with a male co-twin outperformed females with a female co-twin in two of the tasks. The effect sizes for both differences were negligible (η2 < 0.02). Contrary to the previous studies, our results gave no indication that prenatally transferred testosterone, from a male to a female twin, influences sex differences in spatial ability.

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