Neurons in the auditory cortex are organized according to the frequency of sound to which they respond best. Neurons at one end of the auditory cortex respond best to low frequencies, while neurons at the other respond best to high frequencies. Brief auditory stimuli activate the primary auditory cortex earlier than any other cortical area so, within a certain latency range, the primary auditory cortex is the only cortical source contributing to the auditory evoked field.
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