Binaural interaction asymmetries in human ABR's

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Abstract
Ten normal listening subjects heard 100 μs electrical pulses transduced by a TDH-49 headphone, presented monaurally and then binaurally at 60 dB HLn. Auditory brain stem responses were recorded from the scalp in 12 referential and differential configurations: M1, M2, T3, T4, C3, C4, (C2 − M1), (C2 − M2), (T3 − M1), (T4 − M2), (C3 − M1), and (C4 − M2). We found a binaural interaction asymmetry not ascribable to any individual monaural asymmetries nor to any acoustic or vibro-tactile “cross-talk” between the sides. This binaural interaction asymmetry reverses in polarity between mastoid and temporal sites and can be recorded at approximately 6-ms latency from all the recording sites used. [Work supported by scholarships from Ohio University, MRC Grant 9634/19, The Burroughs Wellcome Fund and NINCDS No. NS-11647.]

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