顶内沟外侧壁扫视度量的位置码。
The place code of saccade metrics in the lateral bank of the intraparietal sulcus.
机构信息
Institute of Applied and Computational Mathematics, Foundation for Research and Technology-Hellas, GR-71110 Iraklion, Crete, Greece.
出版信息
J Neurosci. 2010 Jan 20;30(3):1118-27. doi: 10.1523/JNEUROSCI.2268-09.2010.
The lateral intraparietal area (LIP) of monkeys is known to participate in the guidance of rapid eye movements (saccades), but the means it uses to specify movement variables are poorly understood. To determine whether area LIP devotes neural space to encode saccade metrics spatially, we used the quantitative [(14)C]deoxyglucose method to obtain images of the distribution of metabolic activity in the intraparietal sulcus (IPs) of rhesus monkeys trained to repeatedly execute saccades of the same amplitude and direction for the duration of the experiment. Different monkeys were trained to perform saccades of different sizes and in different directions. A clear topography of saccade metrics was found in the cytoarchitectonically identified area LIP ventral (LIPv) contralateral to the direction of the eye movements. We demonstrate that the representation of the vertical meridian runs parallel to the fundus of the IPs and that it is not orthogonal to the representation of the horizontal meridian. Instead, the latter runs through the middle of LIPv parallel to its border with area LIP dorsal (LIPd). The upper part of oculomotor space is represented rostrally and dorsally relative to the horizontal meridian toward the LIPv-LIPd border, whereas the lower part of oculomotor space is represented caudally and ventrally toward the caudal edge of the IPs. Saccade amplitude is also represented in an orderly manner.
猴子的外侧顶内区(LIP)已知参与快速眼球运动(扫视)的引导,但它用来指定运动变量的方法知之甚少。为了确定区域 LIP 是否专门在空间上编码扫视度量的神经空间,我们使用定量 [(14)C]脱氧葡萄糖方法获得猕猴内顶沟(IPs)代谢活性分布的图像,这些猕猴在实验期间被训练重复执行相同幅度和方向的扫视。不同的猴子被训练执行不同大小和不同方向的扫视。在与眼球运动方向相对侧的细胞构筑学鉴定的 LIP 腹侧(LIPv)中发现了扫视度量的明显拓扑结构。我们证明,垂直子午线的表示与 IPs 的底部平行,而不是与水平子午线的表示正交。相反,后者穿过 LIPv 的中间,与 LIP 背侧(LIPd)平行。相对于水平子午线,朝向 LIPv-LIPd 边界,运动空间的上半部分向头侧和背侧表示,而运动空间的下半部分向 IPs 的尾侧和腹侧表示。扫视幅度也以有序的方式表示。