Figure 8.

Dependence of GPDC in theta band on distance between simultaneously recorded channels. (A) Absolute coupling as a function of Euclidian distance across all recorded pairs. Open symbols denote coupling values for single pairs, closed symbols represent the mean ± 1 SD across pairs within three bins. For both monkeys, absolute coupling decreases with increasing distance. (B) Dependence of increases and decreases in GPDC during delay relative to baseline in theta band on distance between simultaneously recorded channels. Absolute decrease (left) and increase (right) in coupling as a function of Euclidian distance across all recorded pairs showing decreases (left) or increases (right) in coupling. In both cases, changes in coupling during delay are higher for smaller distances. Note that we shifted the data points for M1 (blue) and M2 (red) slightly to the left and to the right, respectively for better visual discriminability.