Figure 3.

Eye motion in humans. A, There were no statistically significant peaks at 1 Hz in the dynamics of horizontal or vertical eye position in the random or structured condition in human subjects (n = 30) relative to the four surrounding frequency bins. Vertical bars indicate the mean; boxes indicate the 95% Bayes-bootstrapped high-density interval; circles indicate the individual subjects' data points; and p values are from paired, two-sided t tests of 1 Hz power against the average of four surrounding frequency bins (all p > 0.6). B, Saccade rates time locked to the onset of the first stimulus in a pair showed no statistically significant differences between the structured and the random condition on a time point-by-time point basis (all p > 0.05, FDR corrected). C, There was no entrainment of saccade rates at the pair rate (1 Hz); i.e., there was no distinct peak at 1 Hz compared with the surrounding bins in the structured condition (t₍₂₉₎ = 1.7532, p = 0.0901, g = 0.0434) or in the random condition (t₍₂₉₎ = 0.6698, p = 0.5083, g = 0.0195). Power at 1 Hz also did not differ between the structured and random conditions (mean difference, −0.0001; t₍₂₉₎ = −0.1042; p = 0.9178; g = −0.0131). Shading in B and C represents the SEM across subjects, corrected for intersubject variability (Morey, 2008).