13. The Geschwind-Galaburda Theory:
a) is based on the asymmetry of the planum temporale, which is particularly prominent in males
b) is based on the asymmetry of the planum temporale, with the left hemisphere being smaller than the right for most right-handed people
c) proposes that testosterone is implicated in greater development of the right hemisphere
d) would explain males’ strengths in spatial tasks, but does not account for the increased rate of autoimmune disorders in males
13 c Based on observation of the asymmetry of the planum temporale with the left hemisphere being larger than the right in most right handed people. In males, however, there is less asymmetry – which is proposed to be an effect of testosterone in delaying the development of the left hemisphere, although greater development of the right. This theory provides rationale for the greater spatial skills in males, as well as the increased rate of autoimmune disorders in males. Kolb and Whishaw, Fundamentals of Human Neuropsychology – Fifth Edition, 2003, page 663).