Effects of stimulus conditions on the performance of antisaccades in man
Effects of stimulus conditions on the performance of antisaccades in man
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DOI：
10.1007/pl00005749
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发表时间：
1997-09-01
影响因子：
2
通讯作者：
Weber, H
中科院分区：
文献类型：
--
作者：
Fischer, B;Weber, H
本文研究了不同时空参数对5名成人反扫视动作的跳视反应时间（srt）、不稳定前扫视动作的频率和srt的影响。受试者被指示将他们的扫视瞄准视觉刺激发生的对面。考虑的参数是：间隙持续时间（0到600毫秒之间，重叠范式）；刺激大小（0.1度、0.2度和0.4度，使用间隔200毫秒范式）；刺激偏心率（1度，2度，4度，8度，12度，间隔200毫秒范式）。中间间隔时间（200 ms、250 ms）时，反srt减少，错误率增加，而短间隔时间（0 ms、100 ms和重叠范式）和长间隔时间（600 ms）时，反srt更长，错误率更低。随着偏心距的增大，反srt略有减小，误差频率有所增加；误差的SRT分布与具有相同偏心率的相应任务的表突相似。刺激的规模只有适度的效果，或者根本没有效果。对不规则眼动校正次数的分布分析表明，眼动间间隔可以很短：在快速眼动范围内，在100 ms处出现峰值；有些人甚至更短，峰值在40-50毫秒。结果表明，与眼球运动控制的注视和/或注意系统相互作用的参数影响了抗跳高的性能。支持在刺激开始时脱离注视的参数不仅引起前扫视反应时间的减少，而且引起反扫视反应时间的减少。此外，某种脱离状态似乎会促进反射性错误的发生。
We investigated the effect of different spatial and temporal parameters on the saccadic reaction times (SRTs) of the antisaccades and on the frequency and the SRTs of erratic prosaccades in five adult human subjects. The subjects were instructed to aim their saccades to the side opposite to where a visual go-stimulus occurred. Parameters under consideration were: the gap duration (between 0 and 600 ms, and an overlap paradigm); the stimulus size (sizes of 0.1 degrees, 0.2 degrees, and 0.4 degrees, using the gap 200-ms paradigm); and the stimulus eccentricity (1 degrees, 2 degrees, 4 degrees, 8 degrees, and 12 degrees, with the gap 200-ms paradigm). A decrease in the anti SRTs and an increase in the error rate were observed with medium gap durations (200 ms, 250 ms), while the anti-SRTs were longer and the error rates lower with the shorter values (0 ms, 100 ms, and with the overlap paradigm) and with the long values (600 ms). A slight decrease in the anti-SRTs and an increase in the error frequency occurred with increasing eccentricity; the SRT distributions of the errors resembled closely those of prosaccades in corresponding prosaccade tasks with the same eccentricities. The stimulus size had only modest or no effects at all. Analysis of the distributions of the correction times of the erratic prosaccades showed that the intersaccadic intervals could be very short: in the range of express saccades, with a peak at 100 ms; or in some subjects even shorter, with a peak at 40-50 ms. It is concluded that the performance of antisaccades is influenced by parameters that interact with the fixation and/or attention system of oculomotor control. Parameters supporting a disengagement of fixation at the time of stimulus onset provoke a reduction of the saccadic reaction times not only of prosaccades but also of antisaccades. Moreover, a certain state of disengagement seems to facilitate the occurrence of reflex-like errors.