Burdette L J, Walrath L C, Gross J, James B, Stern J A
Physiol Behav. 1986;37(4):527-32. doi: 10.1016/0031-9384(86)90279-9.
The influence of visual processing demands on saccade-triggered evoked potentials was investigated at P3, P4 and Oz recording sites during reading and tracking tasks. To maximize the physical similarities between tasks, subjects tracked a series of lights that flashed in a stereotypic reading pattern behind a page of text; eye movements recorded during reading initiated the light sequence. In the first experiment, a significant decrease observed in the latency of the major positive peak recorded from Oz during tracking was attributed to the smaller amplitude of tracking, relative to reading, saccades. To confirm this interpretation, the experiment was repeated with modification to the light display. As anticipated, equating saccade amplitudes across tasks eliminated waveform differences in the second experiment. Although peak latencies and amplitudes were not influenced reliably by visual processing demands, tracking potentials exhibited a negative DC shift relative to reading waveforms that was significant at 174 msec at the Oz site. These data suggest that the saccade-triggered evoked potential components generally are insensitive to task differences within the visual modality when visual configuration and eye movement parameters are controlled.
在阅读和跟踪任务期间，于P3、P4和Oz记录位点研究了视觉处理需求对扫视触发诱发电位的影响。为使任务之间的物理相似性最大化，受试者跟踪一系列以刻板阅读模式在一页文本后面闪烁的灯光；阅读期间记录的眼动启动灯光序列。在第一个实验中，在跟踪期间从Oz记录的主要正峰潜伏期显著缩短，这归因于与阅读扫视相比，跟踪扫视的幅度较小。为证实这一解释，对灯光显示进行修改后重复该实验。正如预期的那样，在第二个实验中使各任务的扫视幅度相等消除了波形差异。尽管峰值潜伏期和幅度并未受到视觉处理需求的可靠影响，但与阅读波形相比，跟踪电位在Oz位点于174毫秒时表现出显著的负直流偏移。这些数据表明，当视觉配置和眼动参数得到控制时，扫视触发诱发电位成分通常对视觉模态内的任务差异不敏感。
