Fig. 11.

Sound source separation and interaural correlation. A: left and right sound waveforms were bandpass filtered, and the envelopes of the filtered waveforms were cross-correlated to obtain the interaural envelope coherence. In A, the interaural envelope coherence is plotted against filter center frequency for single sources (black dotted line; same plot for all single-source azimuths) and for the target at +15° and the interferer at 0° under standard (black solid line), ITD-only (gray solid line), and fixed-ITD conditions (gray dashed line). B: broadband interaural cross-correlation coefficient (IACC) sensitivity index is plotted against the central E/S index for every neuron for which both measures were available (n = 16). Filled circles indicate envelope ITD sensitivity, and open circles indicate either no envelope ITD sensitivity or that ITD tuning data were not collected.