Han Shihui, Humphreys Glyn W
Department of Psychology, Peking University, Beijing, P. R. China.
Neurocase. 2007 Aug;13(4):278-89. doi: 10.1080/13554790701649930.
We examined the role of the fronto-parietal cortex in top-down modulation of perceptual grouping by proximity, collinearity, and similarity, by recording event related brain potentials from two patients with fronto-parietal lesions and eight controls. We found that grouping by proximity and collinearity in the controls was indexed by short-latency activities over the medial occipital cortex and long-latency activities over the occipito-parietal areas. For the patients, however, both the short- and long-latency activities were eliminated or weakened. The results suggest that the fronto-parietal network is involved in facilitation of both the early and late grouping processes in the human brain.
我们通过记录两名额顶叶病变患者和八名对照者的事件相关脑电位，研究了额顶叶皮质在由接近性、共线性和相似性进行的自上而下的知觉分组调制中的作用。我们发现，对照组中由接近性和共线性进行的分组由枕叶内侧皮质上的短潜伏期活动和枕顶叶区域上的长潜伏期活动来索引。然而，对于患者来说，短潜伏期和长潜伏期活动都被消除或减弱了。结果表明，额顶叶网络参与促进人类大脑中早期和晚期的分组过程。
