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. Author manuscript; available in PMC: 2024 Apr 10.
Published in final edited form as: Curr Biol. 2023 Mar 1;33(7):1185–1195.e6. doi: 10.1016/j.cub.2023.02.018

Figure 5. Network connectivity between FEF and STG during free viewing of static images.

Figure 5.

Color maps show averaged fixation-locked ITC (A; N = 8 channels, 4 patients; x-axis: time, y-axis: frequency) and power (B) in FEF. Right panels show frequency distributions of ITC (A), power (B) in three time windows relative to fixation-onset: pre-fixation (−400:0 ms; gray), early-post (0:100 ms; orange), late-post (100:400 ms; green). Shading reflects SEM. (C) z-statistics from a Wilcoxon test comparing PSI against a null hypothesis (i.e., PSI not different from zero) relative to fixation onset. Negative values (blue) indicate points when STG leads FEF (i.e., bottom-up), positive values (red) indicate reversed (i.e., top-down) direction. Contours depict significant time-frequency points (p < 0.05 controlled for multiple comparisons). (D) Schematic representation of the network interactions as observed in C. Theta/alpha- (dark blue) and upper beta-band (light blue) interaction from the STG to FEF at about 200 ms prior to fixation (pre-fixation 1). The upper beta activity was attenuated during the saccade and replaced by top-down interaction in lower beta (pre-fixation 2; red), which occurred with theta/alpha-band bottom-up activity (dark blue). After fixation onset, all three activities lasted for about 200 ms (post-early). Vertical line marks fixation onset. Arrows indicate direction of network interaction. See also Figure S5.