Fig. 6: Effects of FEF activation on V1-excitabilty over time as measured by phosphene perception rate.
From: Top-down control of visual cortex by the frontal eye fields through oscillatory realignment
The design was identical as in Fig. 4, but the TMS test pulse was delivered to V1 instead of V5 (n = 7 participants, within-groups design). The average percentage of phosphenes evoked by V1 stimulation (linearly detrended, ±sem) at different time points for the FEF (a) and control (b) condition, represented together with the best-fitting cosine functions (red line) at 17 Hz (not significant) for comparison with Fig. 4a, b. c R-squared differences between attentional and control condition for each fitted cosine model. To test for significant differences, we used a permutation test and considered data significant if they fell above the 97.5th percentile of the null distribution. We found no difference between conditions. For each cosine model, the bounds of the boxplot indicate ±sem, the whiskers represent ±0.95 confidence interval, and the horizontal black line the mean R-squared values. Black dots represent single-subject data. Statistical analysis did not reveal any significant difference between conditions. Source data are provided as a Source data file.
