A neuroimaging study using magnetic resonance imaging to measure brain volume found that the brain volume was negatively correlated to NEO PI-R neuroticism when correcting for possible effects of intracranial volume, sex, and age.
Source: Brian Knutsona, Reza Momenan, Robert R. Rawlings, Grace W. Fong and Daniel Hommer (November 2001). "Negative association of neuroticism with brain volume ratio in healthy humans". Biological Psychiatry 50 (9): 685–690.
My translation: The more neurotic you are, the smaller your brain!!! 😀
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