Abstract
Responses, recorded from scalp electrodes on human subjects were evoked by the onset of three types of modulation of a 100-Hz click train—AM, FM, and time difference modulation (TDM). The last consisted of intracranial sweeps generated by successive increments in the interaural temporal difference between members of dichotic click pairs that composed the train. Slope and extent of TDM were independently varied. All types of modulation produced similar slow-wave responses. The direction of intracranial motion was reflected in the N1-P2 amplitude of the response to TDM in that, lateral-moving sweeps evoked larger response than medial-moving sweeps. Response latency decreased and amplitude increased with increasing TDM slope up to 5.55 msec/sec with little change tereafter. Amplitude also increased with increasing extent of sweep up to 0.55 msec. interaural time difference. Extent of sweep did not systematically affect the latencies of N1 or P2. No right-left differences were observed, [Work supported by Veterans Administration.]
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