| DEL2MAP | Compute the discrete laplacian of an EEG distribution. |
| Usage: | >> [ laplac ] = del2map( map, filename, draw ); |
| Inputs: | |
map |
level of activity (size: nbChannel) |
filename |
filename (.loc file) countaining the coordinates of the electrodes, or array countaining complex positions |
draw |
integer, if not nul draw the gradient (default:0) |
| Output: | |
laplac |
laplacian map. If the input values are in microV and the the sensors placement are in mm, the output values are returned in microV/mm^2. In order to use current density units like milliamps/mm2, you would need to know skin conductance information, which as far as we know is not really known with enough accuracy to be worthwhile. |
| Author: | Arnaud Delorme, CNL / Salk Institute, 2001 Thanks Ramesh Srinivasan and Tom Campbell for the discussion on laplacian output units. |