Orientation discrimination of objects and gratings compared: an fMRI study
Orientation discrimination of objects and gratings compared: an fMRI study
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DOI：
10.1046/j.1460-9568.2001.01399.x
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发表时间：
2001-02-01
影响因子：
3.4
通讯作者：
Orban, GA
中科院分区：
文献类型：
--
作者：
Faillenot, I;Sunaert, S;Orban, GA
我们使用功能磁共振成像来比较参与二维（2D）物体和光栅方向识别的人类大脑区域。在相同视网膜输入的调光检测控制条件下，对定向识别任务、识别任务和逐次识别任务进行了对比。对于两种类型的任务和两种类型的刺激，参与定向辨别的区域非常相似，都属于背侧和腹侧视觉通路。包括枕后区、舌区、后梭状回区、颞下区、顶骨内背区和顶骨内侧区。两种刺激之间的主要区别是，与光栅相比，使用二维物体时楔前叶的激活更大。辨别任务之间的主要区别在于，在群体水平上，识别任务的额上沟活动比连续辨别任务的活动增强，至少在单个受试者水平上，连续辨别任务的右侧梭状皮层活动比识别任务的活动更大。因此，与普遍接受的观点相反，光栅和物体的方向识别涉及很大程度上相似的网络，包括腹侧和背侧视觉区域。
We used functional magnetic resonance imaging to compare the human brain regions involved in orientation discrimination of two-dimensional (2D) objects and gratings. The orientation discrimination tasks, identification and successive discrimination, were contrasted to a dimming detection control condition with identical retinal input. Regions involved in orientation discrimination were very similar for the two types of tasks and for the two types of stimuli and both belonged to the dorsal and ventral visual pathways. They included posterior occipital, lingual, posterior fusiform, inferior temporal, dorsal intraparietal and medial parietal regions. The main difference between the two types of stimuli was a larger activation of precuneus when 2D objects were used compared to gratings. The main difference between discrimination tasks was an enhanced activity, at the group level, in superior frontal sulcus in identification compared to successive discrimination, and at least at the single subject level, a larger activity in right fusiform cortex in successive discriminations compared to identification. Thus, in contradiction to generally accepted views, orientation discrimination of gratings and objects involve largely similar networks including both ventral and dorsal visual regions.