At a neuronal level, the current comparison of cued versus spontaneous vocalizations and hand movements showed impressive and highly significant activity differences; neuronal activity in the frontal lobe remains at baseline level for the monkeys’ spontaneous and non-goal directed vocalizations and hand movements but is strongly modulated for volitional and goal-directed responses.
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Distinct neural networks for the volitional control of vocal and manual actions in the monkey homologue of Broca's area.
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