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Supplementary figure 1. (30.4 KB, PDF) Examples of trial-averaged movement-related potentials (MRPs) recorded in the self-paced, four-direction center out task. MRPs are averaged over trials with movements in all four directions for both session 1 and 2 of subject 1 (294 trials in total). For each recording channel, a subplot is shown with time (from -2 sec to + 2 sec relative to movement onset) on the x-axis and potential amplitude (from -2 to 2 mV) on the y-axis. Colors correspond to the primary motor cortex (M1, orange), premotor cortex (PM, green), prefrontal cortex (PF, blue), frontal eye field (FEF, magenta) as in figure 1 of the paper. The cyan channel was used as a reference channel for the amplifier but all signals analyzed in this paper (including this figure) were re-referenced to a common average reference (CAR). The time course of the CAR is shown at the position of the original reference channels. Besides a baseline correction using the first 200 ms of the time window, no further pre-processing was applied to the data. Pronounced MRPs can be seen in the M1 and PM channels.
Supplementary figure 2. (89.0 KB, PDF) Grid position and decoding maps in subject 2. (a) The grid position in this patient was determined using the methods of curvilinear reconstructions as described in Schulze-Bonhage et al (2002). The central sulcus is marked in white. Red electrodes showed arm motor responses upon direct cortical electrical stimulation, yellow electrodes hand motor responses, and cyan electrodes eye motor responses, respectively. The green dashed line indicates the area corresponding to the maps shown in (b). These maps do not cover the full extent of the grid because they were generated using a spatial sliding window (cf figure 2 of the paper). (b) Maps of decoding accuracy following the conventions of figure 4 of the paper.
Supplementary figure 3. (174.0 KB, PDF) Grid position and decoding maps in subject 3. (a) The grid position in this patient was visualized using the method as described in Kovalev et al (2005). Note that this patient had an unusually large brain. The central sulcus is marked in white. Red electrodes showed arm motor responses upon direct cortical electrical stimulation, yellow electrodes hand motor responses, and cyan electrodes eye motor responses, respectively. Black electrodes were not tested using electrical stimulation mapping. (b) Maps of decoding accuracy following the conventions of figure 4 of the paper. As in supplementary figure 2, these maps do not cover the full extent of the grid.
Supplementary figure 4. (215.0 KB, PDF) Grid position and decoding maps in subject 4. All conventions are as in supplementary figures 2 and 3.
Kovalev D, Spreer J, Honegger J, Zentner J, Schulze-Bonhage A, Huppertz H J 2005 Rapid and fully automated visualization of subdural electrodes in the presurgical evaluation of epilepsy patients Am. J. Neuroradiol. 26 1078-1083
Schulze-Bonhage A H, Huppertz H J, Comeau R M, Honegger J B, Spreer J M, Zentner J K 2002 Visualization of subdural strip and grid electrodes using curvilinear reformatting of 3D MR imaging data sets Am. J. Neuroradiol. 23 400-403
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