Fig. 8.

A–C: responses of 1 neuron that was sensitive to sound identity but not response direction. Top plots show mean firing rates (±SE) after stimulus onset. Middle plots show the responses as dot rasters. Bottom plots quantify the stimulus dependence of the firing rate over time as bits of mutual information in 200-ms sliding time windows. Black lines indicate actual information quantity; red dashed lines represent average information across 200 permutations. Bin size = 200 ms, step = 25 ms. This neuron fired more vigorously to S3 than to S1 during right turn trials (A). but firing in response to left or right turns (combining the responses to different sounds; C) did not differ significantly. D–F: responses of a neuron sensitive to both sound identity and response direction. Plots are as described in A–C. This neuron fired only in trials where the animal turned to the right, and fired substantially more spikes in response to S3 than to S1.