Figure 3.

Temporal coding and the effect of contralateral inhibition. Stimuli were presented dichotically. AN-ipsilateral stimuli were either 4.5 kHz and 65 dB SPL (for experiments on AN1) or 30 kHz and 80 dB SPL (for AN2 recordings). ON1-ipsilateral stimuli, if present, had the same carrier frequency as the AN-ipsilateral stimulus, and sound level was 8 dB higher to mimic free-field stimulation from the ON1-ipsilateral side. A, B, Mean ± SE information transfer functions (n = 13) of AN1 (A), AN2 (B), and ON1 are shown for monaural (labeled I; denoting stimulation from the AN-ipsilateral ear only) and binaural stimuli (I+C; both the AN-ipsilateral and the AN-contralateral ear are stimulated). During monaural stimulation, ON1 fired at similar rate as during silence (<8 spks/s) and did not code the stimulus (data not shown). Inset, Mean firing rates. C, Differences between information transfer curves for monaural and binaural stimulation.