title: The effects of sex, sexual orientation, and digit ratio (2D:4D) on mental rotation performance.
abstract: In spite of the reduced level of experimental control, this large scale study brought some clarity into the relation between mental rotation task (MRT) performance and a number of variables where contradictory associations had previously been reported in the literature. Clear sex differences in MRT were observed for a sample of 134,317 men and 120,783 women, with men outperforming women. There were also MRT differences as a function of sexual orientation: heterosexual men performed better than homosexual men and homosexual women performed better than heterosexual women. Although bisexual men performed better than homosexual men but less well than heterosexual men, no significant differences were observed between bisexual and homosexual women. MRT performance in both men and women peaked in the 20-30 year range, and declined significantly and markedly thereafter. Both men and women showed a significant negative correlation between left and right digit finger ratio and MRT scores, such that individuals with smaller digit ratios (relatively longer ring finger than index finger) performed better than individuals with larger digit ratios.
authors: Department of Psychology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada. mpeters@uoguelph.ca
authors: Michael
authors: M
authors: Peters
authors: John T
authors: JT
authors: Manning
authors: Stian
authors: S
authors: Reimers
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000886:Anthropometry / Q000379:methods; D001824:Body Constitution; D002648:Child; D003867:Depth Perception; D004193:Discrimination Learning; D005006:Ethnicity / Q000706:statistics & numerical data; D005260:Female; D005385:Fingers / Q000033:anatomy & histology*; D006801:Humans; D020407:Internet; D008297:Male; D008875:Middle Aged; D009949:Orientation; D010364:Pattern Recognition, Visual; D011601:Psychophysics; D012016:Reference Values; D015203:Reproducibility of Results; D012727:Sex Characteristics; D017678:Sex Distribution; D019529:Sexuality / Q000706:statistics & numerical data*