Global brain dynamics of transient visual evoked potentials.
The independent component analysis was applied to multichannel transient visual evoked potentials elicited by a high contrast pattern-reversal and motion-onset (motion velocity of 7 and 23 deg/s). Three overlapping independent components with different topographical distribution over the scalp were described. The first component displayed similar timing in response to all three stimuli (40-200 ms) but was a different in shape and scalp projection. This activation component is considered to reflect the stimulus properties. The second component (100-227 ms), related to negativity at about 160 ms, can be referred to visual processing of motion. The last component, attributed to positivity at 230 ms dominates in the fronto-central area and might represent a cognitive process.
Kremlácek
J
J
Department of Pathophysiology, Charles University, Faculty of Medicine, Hradec Králové, Czech Republic. jan.kremlacek@lfhk.cuni.cz
Kuba
M
M
D001921:Brain / Q000502:physiology*; D004566:Electrodes; D004569:Electroencephalography; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D008297:Male; D009039:Motion Perception; D012535:Scalp