Figure 4
From: Theta but not beta activity is modulated by freedom of choice during action selection
Correlations between theta power and RT difference associated with Difficulty in Instructed and Free. (A) Topographical representation of Spearman’s coefficients of the correlation between the difference in baseline-normalized theta power and RT in Instructed as a function of Difficulty (Instructed Hard–Instructed Easy) performed on each electrode separately. Each topographical plot represents the average Spearman’s coefficient in 100-ms windows defined according to target onset. Black dots indicate the electrodes with the highest absolute coefficient, specifically represented in B. (B) Linear fit between the difference in baseline-normalized theta power at parietal electrodes (CPz, CP1, CP3) and the difference in RT in Instructed as a function of Difficulty. (C) Topographical representation of Spearman’s coefficients of the correlation between the difference in baseline-normalized theta power and RT in Free as a function of Difficulty (Free Hard–Free Easy) performed on each electrode separately. Black dots indicate the electrodes with the highest absolute coefficient, specifically represented in D. (D) Linear fit between the difference in baseline-normalized theta power at midfrontal/left premotor electrodes (Fz, F1, FC1) and the difference in RT in Free as a function of Difficulty.
