The Hand Mental Rotation task is assumed to activate an egocentric spatial
reference frame to realize mental rotation. This study presents significant
sex differences in hand mental rotation performances between men and women
(n = 23 and 25, respectively; age: 20.7 yr.). Differences in hand mental r
otation in school girls and boys (ns = 48 and 41, respectively; age: 9 yr.)
were not significant. Our results suggest that the change in sex differenc
es in egocentric mental rotation may occur with developmental change. This
requires further resting with a larger sample so testing can occur at sever
al ages between 9 and 20.7 years.