Figure 15. Spectral coherence of pulse trains for multiband peaky speech narrated by a male (left) and female (right).

Spectral coherence was computed across 1 s slices from 60 unique 64 s multiband peaky speech segments (3840 total slices) for each combination of bands. Each light gray line represents the coherence for one band comparison. (A) There were 45 comparisons across the 10-band (audiological) speech used in experiment 3 (5 frequency bands × 2 ears). The lowest band was unshifted, and the other nine bands had static frequency shifts. (B) There were six comparisons across four pulse trains of the bands in the pilot experiment, which all had dynamic random frequency shifts. Pulse trains (i.e., the input stimuli, or regressors, for the deconvolution) were frequency-dependent (coherent) below 72 Hz for the male multiband speech and 126 Hz for the female multiband speech.

Figure 15—figure supplement 1. Comparison of the common component derived from the average response to six fake pulse trains that were created using static frequency shifts (solid, darker lines; used in the paper) or dynamic random frequency shifts (dashed, lighter lines, pilot data and suggested in 'Materials and methods').

Responses were to 32 min each of male- (left) and female-narrated (right) re-synthesized diotic multiband peaky speech. Areas show ±1 SEM. The electroencephalography to diotic multiband peaky speech (four-bands) was regressed with six fake pulse trains created using the static shifts (used in the paper; the same common component displayed in Figure 4), as well as six fake pulse trains created using the dynamic random frequency shift method (used to create the common component in Figure 15—figure supplement 2).

Figure 15—figure supplement 2. Multiband stimuli responses for male (left) and female (right) derived by deconvolving the absolute value of the dichotic (stereo) multiband peaky audio (from experiment 3) with the 10 associated pulse trains – five pulse trains were used for each band in each ear (‘correct’ pulse trains, top row).

Each pulse train acted as a ‘wrong’ pulse train for the associated band in the other ear (bottom row). Left ear responses are shown by dotted lines and right ear responses by solid lines. Higher frequency bands are shown by lighter red colors. The non-zero responses only occurred when the correct pulse train was paired with the correct audio. Both male- and female-narrated speech responses symmetrically surrounded 0 ms and were largest for the first (lowest frequency) band when the correct, but not fake, pulse trains were used as the regressor in the deconvolution.