Figure 2. Theta rhythmicity in saccade behavior and detection performance.

(A) Distribution of intersaccadic intervals for regular saccades of human subjects exploring natural scenes. Adapted and modified from Otero-Millan et al.³⁵.

(B) Phase bifurcation index as a function of time relative to stimulus onset (x-axis) and frequency (y-axis). Positive values indicate that EEG phase distributions are locked to different phase angles for hits and misses (e.g., in the pre-stimulus time range), while negative values indicate that only one condition is phase locked (e.g., phase locking exclusively for hits in the ERP time range). Left marginal: Average over time; bottom marginal: average over 6–10 Hz.

(C) Topography of phase bifurcation index averaged over 6 to 10 Hz and −300 to −50 ms preceding stimulus onset.

B,C adapted and modified from Busch et al.³⁷ (Copyright 2009 Society for Neuroscience).

(D) Detection performance as function of time relative to saccade landing. Saccades go from an origin grating to a destination grating, and performance is measured and quantified independently for the origin (red) and destination (blue). Adapted and modified from Hogendoorn³⁶.