Figure 2.

Countersign Modulation of Excitability by Visual Environmental Stimuli (LED) versus Motor-Guided Sampling of the Visual Environment (Saccades)

(A) Mustard trace shows the rhythmic LED flash-related translaminar MUA averaged across all 50 trial blocks. The overlaid yellow waveform is the filtered MUA (1.2–2.4 Hz). Yellow dotted lines mark LED flash onsets. Shaded light green block marks pre-event (−200 to −100 ms), whereas shaded dark green block marks post-event (0–100 ms) time interval that we used to quantify event-related MUA modulation. Boxplot to the right shows the pooled normalized MUA amplitudes averaged within the pre-LED flash and post-LED flash onset timeframes. The histogram on the right shows the distribution of mean MUA delta phases at LED flash onset calculated from the band-pass-filtered MUA data. The value of angular mean of the mean phases (marked by dotted lines) and the Rayleigh p value are inset.

(B) Pink trace shows translaminar MUA aligned to saccade onset and averaged across all 50 trial blocks during the resting-state condition. The overlaid orange waveform is the filtered MUA (1–5 Hz). Boxplot to the right shows the pooled MUA amplitudes averaged within the pre- and post-saccade onset timeframes. Bracket marks a significant difference (Wilcoxon signed rank, p < 0.01). The histogram to the right shows the distribution of mean MUA delta/theta phases at saccade onset from the band-pass-filtered MUA data. Dotted line marks angular mean of the mean phases.

(C) Same saccade timing-related data as in (B), but for trial blocks during which the rhythmic LED stream was presented (same trial blocks as A).