################################################################################################# https://pages.ucsd.edu/~msereno/csurf/fsaverage-labels/CsurfMaps1-parcellation/mapdata/README.txt ################################################################################################# Individual Modality Map Data (vertex colors) The six ASCII files in here: % ls -al -rw-r--r-- 1 sereno 742 223504 Mar 24 00:56 lh-mapsaud.cols -rw-r--r-- 1 sereno 742 510208 Mar 24 00:56 lh-mapssom.cols -rw-r--r-- 1 sereno 742 1027531 Mar 24 00:56 lh-mapsvis.cols -rw-r--r-- 1 sereno 742 239221 Mar 24 00:56 rh-mapsaud.cols -rw-r--r-- 1 sereno 742 507200 Mar 24 00:56 rh-mapssom.cols -rw-r--r-- 1 sereno 742 1012271 Mar 24 00:56 rh-mapsvis.cols should be placed in the "label" subdirectory of the FreeSurfer average subject, fsaverage. Each file contains vertexwise colors representing average topological mapping data for the visual, auditory, and somatomotor modalities in the left and right hemisphere. The original publication describing the stimuli and data analysis is here: Sood, M. and M.I. Sereno (2016) Areas activated during naturalistic reading comprehension overlap topological visual, auditory, and somatotomotor maps. Human Brain Mapping 37:2784-2810. https://pages.ucsd.edu/~msereno/papers/LangMaps16.pdf The files specify RGB vertex colors in the range 0-1 of (a subset of) vertices in the FreeSurfer fsaverage surface (7th subtessellation of an icosahedron). The vertex colors are 'intrinsic' colors, *before* lighting calculations have been applied, so the colors are an accurate report of the map coordinate in each modality (visual: lower/middle/upper visual field; auditory: low/mid/high frequencies; somatomotor: foot/hand/face), which corresponds to the phase of the periodic response. Therefore, the same *.cols file will be correctly displayed on differently shaped (and lit) surfaces (the display program is responsible for the lighting calculations). The text file format is: #!ascii ... Here is a example fragment of such a file: ------------------------------------------- #!ascii , from subject fsaverage 10287 509 0.000 0.522 0.960 510 0.072 0.000 1.000 519 0.868 0.019 0.576 520 0.996 0.001 0.504 ... ------------------------------------------- In csurf tksurfer, a vertex color file in a subject's label directory can be read and displayed by selecting it from the "label:" dropdown, and then doing a middle-click on the "R" button on the "label:" line. Here is an example of how the same operation can be done in a csurf tksurfer tcl script: set vclabal $SUBJECTS_DIR/fsaverage/label/lh-mapsvis.cols read_vtxcol_label redraw