Heravian-Shandiz J, Douthwaite W A, Jenkins T C
Department of Optometry, Bradford University, West Yorkshire, UK.
Ophthalmic Physiol Opt. 1992 Oct;12(4):437-42.
To study the effect of voluntary concentration on the visual evoked potential (VEP) with monocular and binocular rivalry stimulation, pattern reversal VEPs were recorded using 5.5 min arc and 50 min arc check sizes. Subjects viewed the VEP stimulus with the left eye and a light emitting diode (LED) with the right eye. They were asked to concentrate on either the VEP stimulus or the LED. The two targets were arranged so that the left eye remained accurately focused on, and directed to, the centre of the VEP stimulus throughout the recordings. The binocular VEP wave became attenuated when the subject concentrated on the LED. The wave was reduced to around two-thirds of the amplitude present when concentrating on the VEP stimulus. This reduction in the VEP amplitude is considered to be due to a binocular interaction because there was a lack of amplitude attenuation when the experiment was repeated with monocular conditions. The results also suggest that the wave is smaller when the non-dominant eye receives the VEP stimulus compared with that when the dominant eye is stimulated by the VEP target.
为研究在单眼和双眼竞争刺激下，自愿集中注意力对视觉诱发电位（VEP）的影响，使用5.5分视角和50分视角的检查视标记录图形翻转VEP。受试者用左眼观看VEP刺激，用右眼观看发光二极管（LED）。要求他们将注意力集中在VEP刺激或LED上。两个目标的排列方式是，在整个记录过程中，左眼始终准确聚焦并对准VEP刺激的中心。当受试者将注意力集中在LED上时，双眼VEP波减弱。该波的幅度减小到集中注意力于VEP刺激时幅度的约三分之二。VEP幅度的这种降低被认为是由于双眼相互作用，因为在单眼条件下重复该实验时没有幅度衰减。结果还表明，与优势眼受到VEP目标刺激时相比，非优势眼接收VEP刺激时该波更小。
