Additionally, there is a biological difference. According to MRIs performed, women have a larger corpus callossum (Halpern, 2000). The corpus collossum is the area of the brain that handles communication between the two hemispheres. It is responsible for synthesizing the information from the left and right side of the brain. In women, the corpus callosum is wider than that of men’s brains, which might enable the two sides to communicate better with each other. This is a theory as to why women might multitask more efficiently.

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Using high-resolution in vivo magnetic resonance morphometry we measured the midsagittal area of the corpus callosum and total forebrain volume in 120 healthy young adults (mean age (+/- s.d.) 25.7 +/- 4.7 years). The forebrain volume-adjusted size of the corpus callosum was larger in women than in men (32 mm2 mean difference; p = 0.011). Handedness had no effect in this measurement. The morphometric data confirm a gender difference in cerebral structural organization. © Lippincott-Raven Publishers.

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