Rizzo Matthew, Nawrot Mark, Sparks Jondavid, Dawson Jeffrey
Department of Neurology, The University of Iowa College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242, USA.
Vision Res. 2008 Nov;48(26):2682-8. doi: 10.1016/j.visres.2008.03.005. Epub 2008 Apr 28.
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.
对视觉运动的感知包括对亮度变化敏感的一阶机制和对对比度变化敏感的二阶运动机制。我们在142名患有视觉皮层损伤的受试者、68名正常对照者和28名脑损伤对照者中研究了这些运动类型的神经基质。在一阶运动方面，视觉皮层损伤组总体上以及在每个半视野中的表现均显著差于正常对照者，但二阶运动方面并无差异。只有一名个体表现出选择性二阶运动缺陷。在被认为包含人类运动处理区域MT（V5）同源物的小枕颞区域之外的病变中也发现了运动缺陷，这表明人类大脑的许多区域都参与视觉运动的处理。
