Physiological detection of interaural phase differences

doi:10.1121/1.2404915

Physiological detection of interaural phase differences

2007-02-01

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DOI：10.1121/1.2404915

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Auditory evoked cortical responses to changes in the interaural phase difference (IPD) were recorded using magnetoencephalography (MEG). Twelve normal-hearing young adults were tested with amplitude-modulated tones with carrier frequencies of 500, 1000, 1250, and 1500Hz. The onset of the stimuli evoked P1m-N1m-P2m cortical responses, as did the changes in the interaural phase. Significant responses to IPD changes were identified at 500 and 1000Hz in all subjects and at 1250Hz in nine subjects, whereas responses were absent in all subjects at 1500Hz, indicating a group mean threshold for detecting IPDs of 1250Hz. Behavioral thresholds were found at 1200Hz using an adaptive two alternative forced choice procedure. Because the physiological responses require phase information, through synchronous bilateral inputs at the level of the auditory brainstem, physiological “change” detection thresholds likely reflect the upper limit of phase synchronous activity in the brainstem. The procedure has potential applications in investigating impaired binaural processing because phase statistic applied to single epoch MEG data allowed individual thresholds to be obtained.

Physiological detection of interaural phase differences

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