Fig. 4.

Grand average of partial correlation coefficients between SRE and power changes in different frequency bands. There was a positive correlation between gamma band power changes and SRE levels but not over the low effort range. There was a negative correlation between beta band power change and SRE levels but not over the high effort range. There was no consistent correlation between theta/alpha power change or high frequency change and SRE, when activities from other frequency bands were controlled, irrespective of effort level. Error bars are SEMs.