Visual topography of human intraparietal sulcus

被引:347
作者
Swisher, Jascha D.
Halko, Mark A.
Merabet, Lotfi B.
McMains, Stephanie A.
Somers, David C.
机构
[1] Boston Univ, Program Neurosci, Perceptual Neuroimaging Lab, Boston, MA 02215 USA
[2] Boston Univ, Dept Psychol, Boston, MA 02215 USA
[3] Harvard Univ, Sch Med, Beth Israel Deaconess Med Ctr, Dept Neurol,Ctr Noninvas Brain Stimulat, Boston, MA 02115 USA
[4] Princeton Univ, Dept Psychol, Neurosci Attent & Percept Lab, Princeton, NJ 08544 USA
[5] Massachusetts Gen Hosp, Dept Radiol, Martinos Ctr Biomed Imaging, Charlestown, MA 02129 USA
关键词
retinotopy; parietal cortex; individual differences; vision; multisensory; tactile;
D O I
10.1523/JNEUROSCI.0991-07.2007
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
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.
引用
收藏
页码:5326 / 5337
页数:12
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