FIG. 1.
The noise level for neural recordings was chosen based on the noise threshold for masking, which was determined for each AN fiber from measured rate-level functions. A Illustrative rate-level function for a harmonic tone complex (HTC) in quiet. HTC threshold (θ TC) was defined as the sound level at which the REF-stimulus response was 10 spikes/s higher than the spontaneous rate. B Illustrative HTC-in-noise rate-level function; HTC level was constant at θ TC + 10 dB. The noise threshold for masking (NoiseThr) was defined as the noise level corresponding to a change of 10 spikes/s from the REF-stimulus-evoked discharge rate (horizontal dashed line).