STEREOPSIS AFTER UNILATERAL ANTERIOR TEMPORAL LOBECTOMY - DISSOCIATION BETWEEN LOCAL AND GLOBAL MEASURES
STEREOPSIS AFTER UNILATERAL ANTERIOR TEMPORAL LOBECTOMY - DISSOCIATION BETWEEN LOCAL AND GLOBAL MEASURES
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DOI：
10.1093/brain/114.3.1323
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发表时间：
1991-06-01
期刊：
影响因子：
14.5
通讯作者：
TOSONI, C
中科院分区：
文献类型：
--
作者：
PTITO, A;ZATORRE, RJ;TOSONI, C
在人类中，枕叶外的损伤可能会导致立体视觉受损。 如果局部和整体立体视觉可以分离，这可能意味着不同的机制介导这些功能。 我们测试了44例单侧前颞叶切除术患者和23名正常对照受试者的两个任务。 在局部立体视觉任务中，受试者指出，这两个引脚之间的差异4和512秒的弧更接近。 结果显示任何组均无阈值损害。 在全球立体视觉任务中，随机点立体图不同的双眼相关性呈随机顺序，和受试者表示，如果在深度感知的广场是在屏幕的前面或后面。 当双眼相关性在50%和70%之间时，左右颞叶切除术导致了缺陷，这在右侧切除术后更为明显。 这些结果与早期的工作（Ptito和Zatorre，1988年），以及其他证据的右脑优势，在处理双眼深度信息是一致的。 此外，在存在完整的局部立体视觉的情况下，整体立体视觉受损的事实表明，涉及密切相关但不相同的机制，并且符合这样的概念，即起源于纹状体皮层的视觉通路存在分层组织，通向颞叶皮层。 因此，整体立体视觉将在颞叶区域中介导，颞叶区域从更靠后的区域接收关于局部差异的信息。
In man, an impairment in stereopsis may occur following damage outside the occipital lobes. If local and global stereopsis can be dissociated, this may imply that different mechanisms mediate these functions. We tested 44 patients with unilateral anterior temporal lobe excisions and 23 normal control subjects on two tasks. In the local stereopsis task, subjects indicated which of two pins varying in disparity between 4 and 512 s of arc was closer. Results showed no threshold impairment in any group. In the global stereopsis task, random-dot stereograms varying in binocular correlation were presented in random order, and subjects indicated if the squares perceived in depth were in front of or behind the screen. At binocular correlations between 50% and 70%, left and right temporal lobectomy resulted in a deficit, which was more marked following right-sided excisions. These results are concordant with earlier work (Ptito and Zatorre, 1988), and with other evidence of a right hemisphere superiority in treating binocular depth information. Moreover, the fact that global stereopsis is impaired in the presence of intact local stereopsis suggests that closely related but not identical mechanisms are involved, and fits the notion that there is a hierarchical organization of the visual pathways originating in the striate cortex leading into temporal cortex. Global stereopsis would thus be mediated in temporal lobe areas that receive information about local disparities from more posterior regions.