猕猴纹外视觉皮层中的视野图簇

Visual field map clusters in macaque extrastriate visual cortex.

作者信息

Kolster Hauke, Mandeville Joseph B, Arsenault John T, Ekstrom Leeland B, Wald Lawrence L, Vanduffel Wim

机构信息

Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts 02129, USA.

出版信息

J Neurosci. 2009 May 27;29(21):7031-9. doi: 10.1523/JNEUROSCI.0518-09.2009.

Abstract

The macaque visual cortex contains >30 different functional visual areas, yet surprisingly little is known about the underlying organizational principles that structure its components into a complete "visual" unit. A recent model of visual cortical organization in humans suggests that visual field maps are organized as clusters. Clusters minimize axonal connections between individual field maps that represent common visual percepts, with different clusters thought to carry out different functions. Experimental support for this hypothesis, however, is lacking in macaques, leaving open the question of whether it is unique to humans or a more general model for primate vision. Here we show, using high-resolution blood oxygen level-dependent functional magnetic resonance imaging data in the awake monkey at 7 T, that the middle temporal area (area MT/V5) and its neighbors are organized as a cluster with a common foveal representation and a circular eccentricity map. This novel view on the functional topography of area MT/V5 and satellites indicates that field map clusters are evolutionarily preserved and may be a fundamental organizational principle of the Old World primate visual cortex.

摘要

猕猴视觉皮层包含30多个不同的功能性视觉区域,但令人惊讶的是,对于将其组成部分构建成一个完整“视觉”单元的潜在组织原则却知之甚少。最近一个关于人类视觉皮层组织的模型表明,视野图是按簇状组织的。簇状结构使代表共同视觉感知的各个视野图之间的轴突连接最小化,不同的簇被认为执行不同的功能。然而,在猕猴中缺乏对这一假设的实验支持,这使得它是人类独有的还是灵长类视觉更普遍的模型这一问题悬而未决。在这里,我们使用7T清醒猴子的高分辨率血氧水平依赖性功能磁共振成像数据表明,颞中区(MT/V5区)及其相邻区域被组织成一个具有共同中央凹表征和圆形离心率图的簇。这种关于MT/V5区及其附属区域功能地形图的新观点表明,视野图簇在进化上是保守的,可能是旧世界灵长类动物视觉皮层的一个基本组织原则。

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