Figure 3. Correlation between S1/M1 power contralateral to isometric contraction at beta frequency and UPDRS III.
During isometric contraction S1/M1 power at beta frequency is significantly correlated with UPDRS III as a measure of motor impairment. Please note that power values from two control subjects (UPDRS III = 0) show a strong overlap. The lowest data point actually represents data from two control subjects.