Sex Hormones, particularly fetal testosterone, have been linked to the development of cerebral laterality and sex-specific cognitive capacities. A putative marker of fetal testosterone exposure, ratio of the second to fourth (2D:4D) finger, has been associated with elements of right hemisphere capacity but few studies have directly examined different abilities concurrently. The present study examined 2D:4D finger length ratio in relation to a two-part visuospatial judgment task and facial emotion recognition task. The findings showed that emotion perception was associated with both hemispheric dominance and 2D:4D finger length ratio in that directional asymmetries favoring the right hemisphere was observed for more feminine 2D:4D patterns whereas masculine 2D:4D demonstrated the opposite association. Visuospatial judgment was not associated with 2D:4D. In contrast to the oversimplified notion that spatial and social perception is specific to one or the other hemisphere, the current results provide further support that varied hemispheric dominance is evident within spatial and social cognitive tasks.

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Kay Chai Peter Tay has been involved in research relating to mental health care and social cognitive psychology over the last six years. His research spans across both basic and applied science approaches including studies which examined gender differences in cognition and social behavior, and evaluative models of intervention programs.