Functional Studies of the Human Central Auditory System

Studies of the neural mechanisms underlying hearing in humans have, with few exceptions, necessarily involved noninvasive and hence indirect methods of measurement of functional brain activity, including EEG, MEG, PET, and fMRI. These methods have proved to be most effective when used in complementary ways.

a. Electrophysiological Measures: EEG and

MEG An electrode placed on the scalp records the summated electrical potentials generated by large groups of neurons in the brain. These neuronal assemblies at each station along the auditory pathway fire sychronously and in sequential order in response to a brief and abrupt acoustic stimulus. This orderly

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