Fig. 4.
Coding of ST patterns vs. coding auditory entities. (A) Distribution of mutual information values across the population of neurons in the IC for coding ST clusters and auditory entities. Horizontal bars are centered on the mean of the distributions, and their length is twice the SEM (one SE on each side of the mean). The two distributions have similar means (t = −0.94, df = 52, P = 0.34). (B) Same as A, for A1 neurons. The two distributions have different means (t = −2.9, df = 88, P < 4 × 10−3). (C) Each circle denotes the normalized MI for one A1 neuron. The MI between ST patterns and responses was estimated by using 4-ms spike patterns; the MI about entities was computed by using spike patterns of variable length (optimized for each neuron separately). The rightmost point was drawn out of scale for clarity and marked by a diamond to emphasize that point. The black rectangle denotes the mean of the distribution. The numbers of neurons below and above the equality line are displayed.