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Different analysis of frequency and amplitude modulations of a continuous tone in the human auditory cortex a neuromagnetic study


, : Different analysis of frequency and amplitude modulations of a continuous tone in the human auditory cortex a neuromagnetic study. Hearing Research 27(3): 257-264

We have measured auditory evoked magnetic fields to intermittent frequency and amplitude modulations of (FMs and AMs) of a continuous tone in 6 healthy humans. The stimuli were presented in pairs separated by 500 ms in four different combinations (FM-AM, FM-FM, AM-FM and AM-AM). Both modulations elicited neuromagnetic responses of similar waveforms: the largest deflection, N100m (magnetic counterpart of the electric N100), was preceded by a low amplitude P60m and followed by P200m. For stimuli of different types, the decrease of N100m from the first to the second reponse was less than expected from the recovery cycle of the responses, estimated from the pairs of similar stimuli. We interpret these results as evidence for different processing of amplitude and frequency modulations in the auditory pathways up to the level of supratemporal auditory cortex.

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Accession: 005151863

PMID: 3610854

DOI: 10.1016/0378-5955(87)90007-4

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