Dichotic and monotic interactions between speech and nonspeech sounds at different stimulus-onset-asynchronies

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Abstract
Target CVs were presented in monotic and dichotic competition with four “challenges” (1) nonspeech parts of CVs, (2) nonspeech “sweeps” of formants, (3) “CV-noise,” made by averaging the waveforms of the targets, and (4) another CV. Subjects were asked to identify targets whose onset led or lagged challenge onset by 0, 20, 40, and 60 msec. A dichotic “lag effect” (better performance on lagging than on leading targets) and a monotic “lead effect” (better performance on leading than on lagging targets) were observed for all challenges. The lead and lag effects appeared to depend on different aspects of the acoustic structure of the challenges, however. The results are interpreted in the context of a model which distinguishes between “peripheral” auditory, “central” auditory, and phonetic processing. [Supported by NIH USPHS Grant NH 11647-01.]

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