FIG. 2.

Spectral clustering identifies clusters corresponding to motor and visual cortex mapped using ECS. ECS results are denoted with colored lines as follows: blue for hand motor, cyan for face motor, red for leg motor, and green for visual cortex. Clusters derived from the infra-slow clustering (ISC) algorithm are denoted in corresponding electrode colors. (A) Results for subject S4 show a cluster of electrodes (blue electrodes) that is spatially consistent with ECS mapping of hand motor cortex (blue lines). Clusters corresponding to ECS mapping of leg motor (red electrodes, red lines) and visual cortex (green electrodes, green lines) are shown on the right. (B) ISC identifies bilateral face motor cortex in subject S6. Note that ECS testing was not performed on the right side, but the location of the ISC cluster is anatomically consistent across both hemispheres. (C) Schematic representation of electrodes with ISC and ECS mapping shown for the remaining subjects shows that each subject has an ISC-identified cluster that corresponds spatially with the ECS maps.