Electrical stimulation of the crossed olivocochlear bundle in anesthetized cats reduces auditory‐nerve responses (N1) if the acoustic stimuli are at low sound‐pressure levels but does not produce detectable changes in neural responses for click stimuli more than 60 to 70 dB above visual‐detection level forN1. When the sound‐pressure levels of high‐frequency (10 000‐Hz) and low frequency (400‐Hz) transient acoustic stimuli were matched according to a physiological criterion, the neural response to the high‐ frequency stimulus was reduced more by olivocochlear bundle stimulation than the response to the low‐frequency stimulus. These result, suggest certain characteristics for the mechanisms which influence the activity of single auditory‐nerve fibers.