Additivity of perceptual channel-crossing effects in auditory gap detection

Five normal listeners were tested in detail for their auditory gap-detectio n thresholds, using stimuli in which the narrow-band noise markers of the g ap differed in one or both of two auditory dimensions (frequency compositio n and ear stimulated). Gap thresholds for stimuli in which the markers diff ered along either single dimension averaged about 18 ms, while thresholds f or markers differing across both dimensions were closer to 28 ms. These dat a suggest that the perceptual relative-timing operation that mediates betwe en-channel gap detection is shared across auditory dimensions. (C) 1999 Aco ustical Society of America. [S0001-3966(99)03301-9].