Spectral analysis of the EEG (alpha rhythm) and activity in the left hemisphere: the effects of lateral gaze.
This study tests the effect of maintaining right and left lateral gaze during a writing task which preferentially implicates the left hemisphere using an asymmetry parameter calculated from the spectral power of the alpha rhythm (RP-LP/RP + LP) in a right-handed patient undergoing the same experimental regimen nine times. A six derivation EEG was recorded. Maintaining left lateral gaze (toward the active hemisphere) removes the lateralization found during writing while staring straight ahead whereas maintaining right lateral gaze (toward the side opposite the active hemisphere) results in slightly lower values which are however, not significantly different from those obtained during staring straight ahead. This study adds an electrophysiologic aspect to Kinsbournes's paradigm on gaze position and hemispheric activation.
de Toffol
B
B
Clinique Neurologique, CHU Bretonneau, Tours, France.
Autret
A
A
Degiovanni
E
E
Roux
S
S
D000328:Adult; D000513:Alpha Rhythm; D004292:Dominance, Cerebral; D004569:Electroencephalography; D005403:Fixation, Ocular; D007839:Functional Laterality; D006236:Handwriting; D006801:Humans; D008297:Male; D009949:Orientation