Abstract
Jayel et al. [J. Acoust. Soc. Am. 63, 1093–1104 (1978)] analyzed two‐tone suppression effects when the excitatory tone (f1 is higher in frequency than the suppressor tone (f2). They concluded that suppression is observable when both f1 and f2 are excitatory and that its magnitude is related in part to the cochlear distance between the traveling wave maxima for the two tones. We extend these observations here to include cases where f2 < f1 as well as f2 > f1 with f2 excitatory. Temporal analyses of phase‐locked discharge patterns of low‐CF neurons indicate that suppression not only exists when f2 is excitatory for both f2 < f1 and f2 > f1) but also that (a) suppression magnitude may exceed 60 dB under appropriate conditions and (b) suppression magnitude declines in an orderly manner as f2 is removed in frequency from f1. For a given suppressor‐tone intensity, however, the decline of suppression magnitude with increasing frequency separation is quantitatively different for f2 < f1 than it is for f2 > f1. [Work supported by a Biomedical Research Development Grant from NIH.]
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