First and second-order motion perception after focal human brain lesions

• Published in: Vision research (Oxford) Vol. 48; no. 26; pp. 2682 - 2688
• Main Authors: Rizzo, Matthew, Nawrot, Mark, Sparks, JonDavid, Dawson, Jeffrey
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2008; Elsevier
• Subjects: Adult; Aged; Aged, 80 and over; Area MT; Biological and medical sciences; Brain Damage, Chronic - physiopathology; Brain Damage, Chronic - psychology; Brain Mapping - methods; Contrast Sensitivity; Eye and associated structures. Visual pathways and centers. Vision; Female; Fundamental and applied biological sciences. Psychology; Humans; Male; Middle Aged; Motion Perception; Occipital lobe; Pattern Recognition, Visual; Perceptual Disorders - etiology; Perceptual Disorders - physiopathology; Perceptual Disorders - psychology; Photic Stimulation - methods; Psychometrics; Sensory Thresholds; Vertebrates: nervous system and sense organs; Visual cortex; Visual Cortex - physiopathology; Young Adult; Visual cortex; Area MT; Occipital lobe; Human; Visual pathway; Stimulus movement; Central nervous system; Lesion; Encephalon
• ISSN: 0042-6989; 1878-5646; 1878-5646
• DOI: 10.1016/j.visres.2008.03.005

Perception of visual motion includes a first-order mechanism sensitive to luminance changes and a second-order motion mechanism sensitive to contrast changes. We studied neural substrates for these motion types in 142 subjects with visual cortex lesions, 68 normal controls and 28 brain lesion controls. On first-order motion, the visual cortex lesion group performed significantly worse than normal controls overall and in each hemifield, but second-order motion did not differ. Only one individual showed a selective second-order motion deficit. Motion deficits were seen with lesions outside the small occipito-temporal region thought to contain a human homolog of motion processing area MT (V5), suggesting that many areas of human brain process visual motion.