Short-term predictive changes in the dynamics of disparity vergence eye movements
Short-term predictive changes in the dynamics of disparity vergence eye movements
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DOI：
10.1167/5.7.4
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发表时间：
2005-01-01
影响因子：
1.8
通讯作者：
Pedrono, C
中科院分区：
文献类型：
--
作者：
Alvarez, TL;Bhavsar, M;Pedrono, C
视差收敛系统对大的收敛阶跃刺激的重复刺激已经被证明增加了对较小的阶跃刺激的后续反应的动力学。在这里，我们表明，视差收敛和发散眼动的动态减少可以使用经常出现的小幅度条件性刺激来修改对更大的、偶尔出现的测试刺激的反应。在一个实验中，一个由重复的1度阶跃刺激组成的简单条件刺激被用来将动态收敛反应修改为偶尔的4度阶跃测试刺激。实验试验包括三个阶段：基线、条件反射和恢复。基线和恢复阶段仅使用4度测试刺激。通过测量峰值速度的大小来量化对测试刺激的反应的动态特性。与基线相比，在条件反应的动态和表明莫迪的恢复反应之间观察到了统计上的显著变化。受条件性刺激的阳离子。在恢复过程中，反应动力学恢复到接近基线水平的水平，表明反应动力学的下降是由条件性刺激而不是疲劳引起的。另一项实验表明，相同的中间条件刺激可以降低对大刺激的反应动力学，而增加对小刺激的反应动力学。其他实验表明，莫迪。阳离子是由一种预测机制造成的。结果表明，视差收敛眼动的动力学具有延展性，并在一定程度上依赖于前一刺激的幅度。
Repetitive stimulation of the disparity vergence system to large convergent step stimuli has been shown to increase the dynamics of subsequent responses to smaller step stimuli. Here we show that decreases in the dynamics of both disparity convergence and divergence eye movements can be induced using a frequently occurring small amplitude conditioning stimulus to modify responses to a larger, occasionally presented test stimulus. In one experiment, a simple conditioning stimulus consisting of repetitive 1 degrees step stimuli was used to modify the dynamic vergence response to an occasional 4 degrees step test stimulus. An experimental trial consisted of three phases: baseline, conditioning, and recovery. The baseline and recovery phases used only the 4 degrees test stimuli. The dynamic characteristics of the responses to test stimuli were quantified by measuring the magnitude of the peak velocity. A statistically significant change was observed between the dynamics of conditioned responses compared to baseline and recovery responses indicting modi. cation by the conditioning stimuli. During recovery, the response dynamics returned to levels near baseline levels showing that the decrease in response dynamics was caused by the conditioning stimulus, not fatigue. Another experiment showed that the response dynamics to large stimuli could be decreased whereas the dynamics of small stimuli could be increased by the same intermediate conditioning stimulus. Other experiments suggest that the modi. cations are due to a predictive mechanism. The results indicate that the dynamics of disparity vergence eye movements are malleable and depend to some extent on the amplitude of preceding stimuli.