Texture segregation in traumatic brain injury--a VEP study.
Visual evoked potentials (VEPs) were recorded to textures segregated by gradients in orientation or motion. Recordings were obtained in traumatic brain-injured (TBI) subjects and in normal controls. We analyzed both the low-level VEPs (llVEPs) evoked by homogenous stimuli, as well as the components associated with texture segregation (tsVEP) obtained through an appropriate linear combination. Our results suggest that the tsVEP, presumably higher up in the visual processing chain than the llVEP, is sensitive to TBI and can reveal further information as to the nature of possible information processing deficits after TBI. It could also help quantify cortical damage that is not revealed with more standard clinical tools.
Lachapelle
Julie
J
Centre de Recherche Interdisciplinaire en Réadaptation, Site Centre de Réadaptation Lucie-Bruneau, 2275 Laurier Avenue East, Montréal, Qué., Canada H2H 2N8.
Ouimet
Catherine
C
Bach
Michael
M
Ptito
Alain
A
McKerral
Michelle
M
D000328:Adult; D001930:Brain Injuries / Q000150:complications / Q000503:physiopathology / Q000523:psychology*; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009039:Motion Perception; D009949:Orientation; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D014786:Vision Disorders / Q000209:etiology / Q000503:physiopathology; D014793:Visual Cortex / Q000503:physiopathology