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(4) Spatio-temporal dipole modeling of EEGs during perception of straight movements.
¡¡¡¡13th European Conference on Eye Movements, PA-178, 2005-8
Electroencephalograms (EEGs) were recorded when healthy subjects, four women aged from 22 to 23, observed the straight down, up, right, left or random (reference stimulus) movement of a white-filled circle displayed on a cathode-ray tube (CRT). Thirty data from EFGs (l9 channels) were summed for each movement, and the equivalent current dipole localization (ECDL) method was applied to the averaged data. Results indicated that dipoles were localized to the middle temporal gyrus at 80 - 120 ms latency, to the intraparietal sulcus at l40 - 180 ms latency, to the precentral gyrus at 210 - 250 ms latency and to the frontal eye field at 210 - 260 ms latency. This spatio-temporal transition was common to all subjects. The directions of the estimated dipoles were found to be opposite corresponding to those of eye movements. Moreover, dipoles were located at the superior colliculus, which is thought to be related with the eye movement.
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