Evoked Potential Correlates of Interaural Phase Reversals

Abstract

Human auditory evoked potentials were recorded from the vertex in a variety of interaural stimulus conditions over a broad range of intensities. The amplitude of the N1-P2 component of the evoked potential was greater for antiphasic than for homophasic stimuli, reflecting the loudness differences reported by others at low signal-to-noise ratios. At higher signal-to-noise ratios or in the absence of an external noise masker where loudness differences disappear, however, a difference between N1-P2 amplitudes evoked by homophasic and antiphasic stimuli persists

Key Words:

• Auditory evoked potential (AEP)
• Interaural phase
• Masking level difference (MLD)
• Electric response audiometry (ERA)
• Loudness