Figure 2.

Figure-onset-aligned responses of an example site

(A) Thresholded multi-unit spiking activity (black) and the multi-unit activity envelope (gray) in response to individual SFG stimuli are shown. Twelve different test stimuli were presented, of which 50% contained figures with Coh8 (green, top row). The remaining test stimuli contained figures with Coh12 (red, bottom row). Different plots correspond to individual figure-onset-aligned responses to different SFG stimuli. Figure onset is indicated by a dashed line at time zero. Raster plots are shown on top. Each row corresponds to a trial and each point within a trial to a single spike. Responses are baseline normalized, averaged over all trials. Single chords of the SFG stimulus are indicated in black. The standard error of the mean is illustrated as a shaded area.

(B) Fast Fourier transform (FFT) of averaged MUA to SFG control stimuli for this recording site, which was normalized to the maximum power. The 20-Hz peak (black arrow) indicates rhythmic responses to each presented chord.

(C) Mean MUA amplitude for stimuli of each coherence condition averaged in time window 201 to 400 ms after figure onset. Due to the small sample size (n = 6 for figure stimuli, n = 8 for control stimuli), no statistical test is shown.

(D) Quantification of frequency elements that fall into the frequency-response area (see E) of the recording site for the first eight chords after figure onset shown for each stimulus. Color-coded points show stimulus-wise data. Gray lines demonstrate stimulus-wise linear regression of elements in RF.

(E) Pure tone tuning curve of the example site averaged across sound intensities and then normalized to maximum response. Dashed line indicates half maximum. “Responsive” area indicated in gray.