[Dissociation of visual evoked responses to hemi-field or full-field flash-checkerboard stimulation].
Unexpected visual evoked responses (VERs) were recorded in 5 subjects with tumoral, ischemic or hemorrhagic lesions of the retrochiasmatic visual pathways. The flash pattern stimulation was always binocular and involved full-field and half-field stimuli. In these 5 cases, the total field VER was asymmetrical with anomalies on the affected occipital region. However half-field VERs P100 contralateral to the stimulus were noted both on the normal and on the affected occipital region. One can ask if this is not an electrophysiological equivalent of the clinical relative hemianopsia.
D000328:Adult; D000368:Aged; D002545:Brain Ischemia / Q000503:physiopathology; D001932:Brain Neoplasms / Q000503:physiopathology*; D002543:Cerebral Hemorrhage / Q000503:physiopathology; D002561:Cerebrovascular Disorders / Q000503:physiopathology*; D005074:Evoked Potentials, Visual; D005260:Female; D006406:Hematoma / Q000503:physiopathology; D006801:Humans; D008223:Lymphoma / Q000503:physiopathology; D008297:Male; D008577:Meningeal Neoplasms / Q000503:physiopathology; D008579:Meningioma / Q000503:physiopathology; D008875:Middle Aged; D009778:Occipital Lobe / Q000098:blood supply; D010296:Parietal Lobe; D014794:Visual Fields; D014795:Visual Pathways
Dissociation des réponses visuelles evoquées à la stimulation flash-damier d'un hémichamp ou du champ total.