Figure 13.
Results of additional acoustic features in the OT and ICX. A, Population average response to a constant order sequence. The first 10 bars show the average responses to a sequence of sounds with low ABSI, the second 10 bars show the responses to a sequence of sounds with a higher ABSI (30 dB relative to the ABSI of the low sound). B, Scatterplot of SI1 versus SI2 of the same neurons as in A. The gray points designate recordings from single units. The inset shows the distribution of the NIs. The abscissa of the NI histogram is between −0.2 and 0.55 in all histograms. C, The population PSTHs, normalized and averaged, are shown for the rare stimulus (gray line) and for the frequent stimulus (black line). The responses to the low-intensity sound and to the high-intensity sound are shown separately in the top and bottom plots, respectively. D–F, Results from neurons in the ICX tested under the same stimulus conditions as in A–C. D, The population response to the constant order sequence. E, NI distribution and scatterplot of SIs. F, Population PSTH responses to rare (gray line) and frequent (black line) sound intensities. Responses to both low and high intensities are averaged together. G, Population response to a constant order sequence in which the ILD of the first 10 stimuli differed by 15 dB (toward contra lateral ear louder) from the ILD displayed in the second 10 stimuli. H, The scatterplot of SIs and the distribution of the NIs of all ILD tests. The gray points designate recordings from single units. I, The average response to rare (gray line) and frequent (black line) stimulus are shown separately for the louder contralateral ear (top plot) and the louder ipsilateral ear (bottom plot). J–L, Results from neurons in the ICX under the same stimulus conditions as in G–I.