Forward and simultaneous tonal suppression of single-fiber responses in the chinchilla auditory nerve

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Abstract
Response patterns (PST histograms) of auditory nerve fiber discharges with two‐tone stimuli were obtained. The two tones either overlapped (simultaneous suppression) or were temporally separated (forward suppression). The response elicited by a probe tone at the fiber's CF decreases when immediately preceded by a masking tone. It was found that the frequency/intensity combinations of effective maskers lie within the tuning curve of the fiber. In simultaneous two‐tone suppression the frequency/intensity contours of the masker are broader than those observed in the forward suppression condition. The post stimulus suppression in firing below spontaneous rate, which is typically observed following maintained excitation, is suggested as the single‐fiber substrate for forward suppression and masking effects observed in AP and psychophysics. [Supported by Grants from the NINCDS.]

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