A part of the brain that’s involved in sound processing shows pronounced activity when rhesus monkeys hear their comrades vocalizing but not when the same animals hear other sounds, a new brain-scan investigation finds.
In human evolution, this call-oriented, left-hemisphere region served as a precursor of the left-brain structures that now contribute to speech understanding, propose Amy Poremba of the University of Iowa in Iowa City and her coworkers.
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