Sex Differences in Mental Rotation Performance Through Holding Weights By the Hands

Mental rotation is known to be mediated by sensorimotor processes. To deepen our understanding of the role of somatosensory inputs in mental rotation, we investigated the effects of holding weight by the hands on mental rotation performance. In an experiment, 22 male and 22 female students performed a chronometric mental rotation task while holding either light or heavy bags in both hands. Results showed that females holding heavy bags were quicker and more accurate at mental rotation than females holding light bags, as evidenced by shallower slopes for response times (RTs) and error rates. In contrast, males showed no such heavy-bag-induced improvement. Unlike slopes, intercepts for RTs and error rates were equivalent regardless of sex and bag weight. Consistent with previous research on embodied cognition, the present findings demonstrated the facilitatory role of somatosensory cues by weight in mental rotation and suggested sex differences in embodied processes in mental rotation.