Fig. 8: Relationship between covert attentional fluctuations and oculomotor activity.
From: Rhythmic sampling of multiple decision alternatives in the human brain
a Average (micro)saccade (MS) rate during task execution. The thick line indicates the average over participants, and the shaded area the SEM. Vertical dashed lines indicate the stimulus onset, framing cue onset and offset, as well as the stimulus offset. The horizontal line indicates the average MS rate over the stimulus on period (1.14 Hz). b Inter-saccade-interval histograms for micro(saccades). Thick and thin lines display the group-average and single-participant ISI histograms (nparticipant = 19), respectively. c T-scores of oculomotor event rates, i.e., (micro)saccade, pre- and post-attentional saccades (switch in green, stay orange) tested against shuffled events (two-sided t test per timepoint). The thick colored bar denotes statistical significance (df = 18, pFDR < 0.05; FDR-corrected over time). d Attention strength around (micro)saccade onset. The data is z-scored based on the 0.4 s prior to MS. The black line indicates the average over participants, and the shaded area the SEM. The thick bar denotes statistical significance from zero (two-sided t test(18) per timepoint, pFDR < 0.05, FDR-corrected over time). e The correlation of the attentional event probability (Supplementary Fig. S11) with the trial-averaged (micro)saccade rate (MS-rate) a for each participant (nparticipant = 19). The bars and vertical lines display the average and SEM over participants, respectively. The colored dots represent the single participant Pearson correlation coefficients (color-coded as in c). Asterisk denotes significant correlations (two-sided t test(18) for |r | > 0, uncorrected p = 0.0047). f Proportion of attentional events preceded by (micro)saccades (MS). Color-coded as above. Bars, vertical black lines and colored dots display the mean and SEM over participants as well as single participant data (nparticipant = 19). Asterisk denotes significant difference between switch and stay (two-sided t test(18), uncorrected p = 2.31*10-10). g, h Mean inter-event-interval histograms for stay (g) and switch (h) attentional events split into events with (dashed) and without a (micro)saccade (solid line) between successive events. Colored lines and shaded areas denote mean and SEM over participants (nparticipant = 19). Color-coded as above. The thick colored bar denotes statistical significance (one-sided t test(18) for No MS > post-MS; pFDR < 0.025, FDR-corrected over time).
