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Auditory Spectral Integration in Nontraditional Speech Cues in Diotic and Dichotic Listening

Underlying auditory processes in speech perception were explored. Specifically of interest were the stages of auditory processing involved in the integration of dynamic information in nontraditional speech cues such as the virtual formant transitions. These signals utilize intensity ratio cues and changes in spectral center-of-gravity (instead of the actual formant frequency transitions) to produce perceived F3 glides. 6 men and 8 women (M age = 24.2 yr., SD = 2.1), recruited through posted materials from graduate students at The Ohio State University, participated in two experiments. The results for frequency-based formant transitions (Exp. 1) indicated that spectral cues to syllable identification are combined at more central levels of auditory processing. However, when the components of the virtual formant stimuli were divided between the ears in a dichotic listening task (Exp. 2), the results indicated that auditory spectral integration may occur above the auditory periphery but at stages more intermediate rather than central.