PMID: 2316342Mar 1, 1990

Coherence analysis of scalp responses to amplitude-modulated tones

Acta Oto-laryngologica
D L TucciR A Dobie

Abstract

Magnitude squared coherence is a method of auditory evoked potential (AEP) frequency-domain analysis, measuring the degree to which the AEP is determined by the stimulus as a function of frequency. In 10 normal-hearing human subjects, scalp responses to an amplitude-modulated (AM) tone (500 Hz carrier modulated with a 40 Hz envelope) were recorded. Critical value criteria were utilized in the statistical analysis of coherence-intensity functions for determination of threshold responses. When compared with subjective determination of AEP threshold from time-domain waveforms, coherence analysis provided a significantly (p less than 0.001) more sensitive threshold measure. Coherence analysis provides information on the spectral content of the response, and allows for the objective determination of threshold which may potentially be utilized in a more expeditious threshold measurement scheme.

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Citations

May 1, 1990·Electroencephalography and Clinical Neurophysiology·R A Dobie, M J Wilson
May 1, 1991·Electroencephalography and Clinical Neurophysiology·R A Dobie, M J Wilson
Sep 1, 1994·Electroencephalography and Clinical Neurophysiology·R A Dobie, M J Wilson
Nov 1, 1993·Electroencephalography and Clinical Neurophysiology·R A Dobie, M J Wilson
Jan 15, 1999·Audiology : Official Organ of the International Society of Audiology·D Parker, D O'Dwyer

Related Concepts

Acoustic Stimulation
Auditory Threshold
Auditory Evoked Potentials
Scalp Structure

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