Blum B, van den Enden A, Reits D, Spekreijse H
The Netherlands Ophthalmic Research Institute, Amsterdam.
Metab Pediatr Syst Ophthalmol (1985). 1996;19-20:45-53.
The purpose of this study was to compare visual evoked potentials (VEPs) of striate-peristriate and Cz to posterior parietal, especially IPL's supramarginal (Su) and angular (Ang, Ano, and Ant) leads in response to human face spatial attributes attend-task, to assess the concern of the former with basic features versus the latter's spatial attributes "rotated" rightwards, leftwards, or oblique (unusual angle of sight) or nodal one (eye)- and two-item, eye/mouth displacement. Monopolar cranially derived VEPs were recorded bihemispherically from six adults using 12 electrode arrays 1.5 to 2 cm apart. Subjects were instructed to fixate a marking on the monitor at a nodal eyebrow region, while attending the stimulus that was computer displayed for 200 or 300 ms, and followed by mask. Analysis was made on the first 240 ms of the records after stimulus onset; the test was compared to "full face," the hypothesized control. Localized VEP changes were observed task-bound and bihemispherically coherent in parietal leads, especially Ang, Ano, and Su. The early negativity of the "full face" control was replaced by an early positive wave with onset latencies of 70 +/- 15 ms, significantly shorter (p < 0.01) than the striate's 90 +/- 20 ms. The changes were observed for both rotation and displacement. The changes in the angular leads (Ano and Ang) are consistent with the encoding of spatial attributes of orientation and nodal face items displacement. Differentiation of direction and degree of rotation, "seen from above" versus "seen from below," largely encoded by the right Su. The composite double-item eye and displaced or obliquely rotated induced extended coherent activity in parietal leads. Oz, peristriate, and Cz showed no such changes. No attempt is made to imply source localization; we claim parietal localized and coherency of the VEP changes suggest high-order early processing of human face attributes. This occurs by a relatively fast pathway. The "triggers" for the changes are direction and degree of rotation or of displacement rather than actual geometry of the stimulus.
本研究的目的是比较纹状-纹周区和Cz点与顶叶后部，特别是角回（Ang）、顶上小叶（Su）的视觉诱发电位（VEP），这些部位对人脸空间属性注意任务的反应，以评估前者对基本特征的关注程度，以及后者对向右、向左或倾斜（不寻常视角）或单节点（眼睛）和双项目（眼睛/嘴巴）位移的空间属性的关注程度。使用间距为1.5至2厘米的12个电极阵列，从6名成年人的双侧半球记录颅骨单极导出的VEP。受试者被指示注视显示器上眉结节区域的一个标记，同时关注计算机显示200或300毫秒的刺激，随后是掩蔽。在刺激开始后的前240毫秒的记录上进行分析；将测试与“全脸”（假设的对照）进行比较。在顶叶导联，特别是角回、颞上沟和顶上小叶，观察到与任务相关且双侧半球连贯的局部VEP变化。“全脸”对照的早期负波被一个早期正波取代，起始潜伏期为70±15毫秒，明显短于纹状区的90±20毫秒（p<0.01）。旋转和位移时均观察到这些变化。角回导联（颞上沟和角回）的变化与方向和节点面部项目位移的空间属性编码一致。从“上方看”与“从下方看”的旋转方向和程度的区分，主要由右侧顶上小叶编码。复合双项目眼睛和位移或倾斜旋转在顶叶导联诱导出延长的连贯活动。枕区、纹周区和Cz点未显示此类变化。本研究未尝试暗示源定位；我们认为顶叶局部化和VEP变化的连贯性表明人脸属性的高阶早期处理。这是通过一条相对快速的通路发生的。这些变化的“触发因素”是旋转或位移的方向和程度，而不是刺激的实际几何形状。
