Bh. Bae et al., HUMAN BRAIN CORTICAL ELECTRIC-CURRENT SOURCE LOCALIZATION FROM THE SURFACE LAPLACIAN OF A VISUAL AND MOTOR EVENT-RELATED POTENTIAL, Journal of the Korean Physical Society, 32(2), 1998, pp. 166-170
The surface Laplacian of the human-brain event-related potential were
applied to an experiment designed to compare the known cognitive sites
for mental tasks with the peak positions of the surface Laplacians of
the subject's cortical electric potentials at each instant during a t
ask. The computer was programmed to present randomly a letter 'L' or '
R' On a computer screen. When the monitor commands the subject to pres
s the keyboard with subject's left (right) index finger depending on '
L' ('R'), the subject presses the left (right) shift-key on the keyboa
rd. Multichannel event-related potentials were used to estimate the di
stributions of the surface Laplacians of cortically generated electric
potentials on the scalp. The locus of the surface Laplacian peak corr
esponds to the sites and the stages of cortical source localization of
the neural activity in both the visual and the motor area. The locus
of the surface Laplacian peak seems to track the sequence of known cor
tical localization of cognitive process.