Figure 3.
Delta phase predicts contrast gain in Regular conditions. A, Color maps show the relationship between delta phase and contrast gain in regular (top) and irregular (bottom) conditions. Black line superimposed onto color maps indicates the mean delta phase across participants. Notice how the mean phase in regular conditions is closely superimposed to what is the optimal phase for performance. Lower line plot shows the correlation between delta phase and contrast gain in time. Black line indicates where correlation between delta phase and contrast gain was higher in regular than in irregular conditions (cluster p < 0.05). Shaded error bars indicate confidence intervals (5–95%) estimated by a jackknife procedure (removing one subject per time). B, Left, Line plots show contrast gain as a function of the distance from mean phase in the pretarget period (140–30 ms). In regular conditions, contrast gain decreases as distance from mean phase increases (peak-to-trough t(15) = 3.39, p < 0.01). No clear pattern is observed in irregular conditions (peak-to-trough t(15) = 0.55, p > 0.5). Right, Line plots show residual response times as a function of the distance from mean phase in the same pretarget period (140–30 ms). In regular conditions, response times increases as distance from mean phase increases (peak-to-trough t(15) = −2.20, p < 0.05). No clear pattern is observed in irregular conditions (peak-to-trough t(15) = −0.88, p > 0.3). C, Line plots shows the concentration of delta phase around the best phase for performance (V test, see main text) in regular and irregular conditions. Black line indicates where concentration around best phase was significantly higher in regular conditions (cluster p < 0.05). Shaded error bars indicate confidence intervals (5–95%) estimated by a jackknife procedure (removing one subject per time). Circular plot indicates the distribution of delta phase around the best phase (0°) in the pretarget period (140–30 ms). The size of the arrows indicates the phase locking factor of the distribution. Dashed inset lines indicates PLV values of 0.2 and 0.4.