We examined the neural difference between cooperated face-to-face humming by simultaneously measuring two brains using a hyperscanning approach. Results showed a significant increase in the neural synchronization between two brains in the right inferior frontal cortex during a non-face-to-face humming. Thus we found the inferior frontal cortex of the right brain plays a critical role in vocal humming.
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Osaka et al. (2014) studied this question.