Fig. 7.

Spatial distribution of spectral changes related to upper and lower limb movements across electrodes. (A) illustrates the number of DBS leads (maximum n = 20) in which the maximal modulation at each frequency (13–85 Hz) occurred at the same contact for upper and lower limb movements. Contacts were more likely identical for beta frequencies (13–35 Hz: 6.7 ± 0.3 identical contacts) than for gamma frequencies (55–85 Hz: 3.4 ± 0.3 identical contacts), p < 0.001 (ranksum test). (B) correlations between the degree of modulation of all directional contacts during upper vs. lower limb movements. Illustrated are the Fisher’s Z-transformed and averaged Spearman’s correlation coefficients across the same frequency range as above. Similar as in (A), a relatively high correlation, i.e. less spatial discrimination within the DBS lead, was found for modulation at beta frequencies, and more spatial heterogeneity for the modulation at gamma frequencies where r-values dropped to near zero. Lines depict means ± SEM.