人类顶内沟的视觉地形图。

Visual topography of human intraparietal sulcus.

作者信息

Swisher Jascha D, Halko Mark A, Merabet Lotfi B, McMains Stephanie A, Somers David C

机构信息

Perceptual Neuroimaging Laboratory, Program in Neuroscience and Department of Psychology, Boston University, Boston, Massachusetts 02215, USA.

出版信息

J Neurosci. 2007 May 16;27(20):5326-37. doi: 10.1523/JNEUROSCI.0991-07.2007.

Abstract

Human parietal cortex is implicated in a wide variety of sensory and cognitive functions, yet its precise organization remains unclear. Visual field maps provide a potential structural basis for descriptions of functional organization. Here, we detail the topography of a series of five maps of the contralateral visual hemifield within human posterior parietal cortex. These maps are located along the medial bank of the intraparietal sulcus (IPS) and are revealed by direct visual stimulation during functional magnetic resonance imaging, allowing these parietal regions to be routinely and reliably identified simultaneously with occipital visual areas. Two of these maps (IPS3 and IPS4) are novel, whereas two others (IPS1 and IPS2) have previously been revealed only by higher-order cognitive tasks. Area V7, a previously identified visual map, is observed to lie within posterior IPS and to share a foveal representation with IPS1. These parietal maps are reliably observed across scan sessions; however, their precise topography varies between individuals. The multimodal organization of posterior IPS mirrors this variability in visual topography, with complementary tactile activations found immediately adjacent to the visual maps both medially and laterally. These visual maps may provide a practical framework in which to characterize the functional organization of human IPS.

摘要

人类顶叶皮层参与多种感觉和认知功能,但其精确组织仍不清楚。视野图为功能组织的描述提供了潜在的结构基础。在这里,我们详细描述了人类后顶叶皮层中一系列五个对侧视觉半视野图的地形。这些图位于顶内沟(IPS)的内侧壁,通过功能磁共振成像期间的直接视觉刺激显示出来,从而使这些顶叶区域能够与枕叶视觉区域同时被常规且可靠地识别。其中两张图(IPS3和IPS4)是新发现的,而另外两张图(IPS1和IPS2)之前仅通过高阶认知任务才被揭示。先前已确定的视觉图V7位于IPS后部,并与IPS1共享中央凹表征。这些顶叶图在各个扫描过程中都能可靠地观察到;然而,它们的确切地形在个体之间存在差异。IPS后部的多模态组织反映了视觉地形的这种变异性,在内侧和外侧紧邻视觉图的位置都发现了互补的触觉激活。这些视觉图可能为描述人类IPS的功能组织提供一个实用的框架。

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