AFTERIMAGE MOVEMENT DURING SACCADES IN THE DARK
AFTERIMAGE MOVEMENT DURING SACCADES IN THE DARK
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DOI：
10.1016/0042-6989(87)90184-2
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发表时间：
1987-01-01
期刊：
影响因子：
1.8
通讯作者：
WEISS, LR
中科院分区：
文献类型：
--
作者：
GRUSSER, OJ;KRIZIC, A;WEISS, LR
视网膜坐标的空间值在扫视期间和之后在几分之一秒内被“重新校准”到“自我中心”坐标。我们通过后像技术测量了这种视网膜坐标转换的时间常数：我们的十名受试者在完全黑暗中进行“听觉”水平扫视（0.2-4.5扫视/秒）。在低于1扫视/秒的扫视频率下，受试者观察到中央凹后像的扫视位移，但后像似乎比凝视中心（状态1）更慢地到达其最终位置。在扫视频率高于1.5扫视/秒，感知振幅的后像位移随扫视频率的增加而降低（状态2）。在2次扫视/秒以上，所有受试者在扫视结束位置同时感知到两个静止的后像（状态3）。进一步增加眼跳频率会使两个后像之间的距离减小，直到眼跳频率高于3.2-3.5眼跳/秒时，在两个听觉目标之间的中间位置只看到一个静止后像（状态4）。扫视幅度在0.2和4.5扫视/秒之间的频率范围内保持恒定。一步或两步线性模型被用来模拟实验数据，表明空间坐标的移动比扫视眼动慢。
The spatial values of retinal coordinates are “recalibrated” to the “egocentric” coordinates during and after a saccade within a fraction of a second. We measured the time constant of this retinal coordinate transformation by means of an afterimage technique: our ten subjects performed “auditory” horizontal saccades in total darkness (0.2–4.5 saccades/sec). At a saccade frequency below 1 saccade/sec, the subjects observed saccadic displacement of the foveal afterimage, but the afterimage seemed to arrive at its final position more slowly than the center of gaze (state 1). At saccade frequencies above 1.5 saccades/sec, the perceived amplitude of afterimage displacement decreased with increased saccade frequency (state 2). Above 2 saccades/sec all subjects perceivedtwostationary afterimages simultaneously at the saccadic end-position (state 3). A further increases in saccade frequency reduced the distance between the two afterimages till only onestationaryafterimage was seen in a mid-position between the two auditory targets at a saccade frequency above 3.2–3.5 saccades/sec (state 4). Saccade amplitude remained constant within the frequency range between 0.2 and 4.5 saccades/sec. A one-step or two-step linear model was applied to simulate the experimental data, indicating that the spatial coordinates shift more slowly than the saccadic eye movements.