Studies such as this confirm that human and chimp brains are not only asymmetrical, but asymmetrical in the same way. The findings echo previous looks at the non-limbic parts of chimpanzee brains, which also appear human-like in their patterns of asymmetry. This fact, especially if studied in the context of functional behaviors that reflect asymmetries, may help scientists get a better fix on the evolution of the limbic system in all primates, including humans.
Says Hopkins, “The limbic system asymmetries advance the position that asymmetries are fundamental aspects of the nervous system of all primates, and apply to more primitive systems in the brain.” The asymmetries influence behavior. Given the new findings about chimps and previous findings that the limbic system affects human facial expression and emotions, it now seems more clear why across primates, says Hopkins, the left half of the face – controlled by the right side of the brain -- is more emotionally expressive. In addition, a right-dominant hippocampus would explain apes' well-developed spatial memory. Again, that parallels how the right hippocampus in humans is involved in spatial memory.
In a second study, Hopkins and Cantalupo report the first-ever evidence of an association between hand preference and asymmetries in three areas of the brain cortex in chimps. Observing 66 chimps, they correlated asymmetries in brain anatomy with three measures of handedness: Simple reaching (which hand chimps used to pick up a raisin thrown into the cage), two-handed feeding (which hand chimps used to feed themselves chunks of fruit while holding the whole piece, such as a banana, in the other hand), and a measure of coordinated bimanual actions (which hand chimps used to fish peanut butter from a plastic tube with a finger).
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