Nonlinear alteration of transient vergence dynamics after sustained convergence.
Nonlinear alteration of transient vergence dynamics after sustained convergence.
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持续收敛后瞬态聚散动力学的非线性变化。
DOI：
10.1097/00006324-199909000-00024
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Ogmen,H
中科院分区：
文献类型：
--
作者：
Patel,SS;Jiang,BC;White,JM;Ogmen,H
背景：水平视差聚散度系统的自适应模型假设一个非自适应的瞬态分量。他们还预测相同的后适应动态收敛和发散movements.Method>：为了测试的瞬态组件的适应属性，进行了一组实验，其中闭环的聚散动态测量前后持续收敛进行了比较，主要是通过比较的峰值聚散速度，峰值聚散速度的出现时间，和稳态聚散姿势。持续时间为30，60，90秒的持续收敛后的聚散动力学进行了比较与控制持续时间为5秒后。结果：峰值发散速度减少约25%，持续聚散30秒内。然而，峰值会聚速度是不变的所有曝光时间。此外，对于所有持续时间，峰值发散速度显著高于峰值会聚速度。与峰值速度相比，峰值会聚和发散速度的出现时间没有显著差异，并且在所有持续时间内保持不变。结论：瞬态分量具有适应性。此外，适应是方向依赖性的，并且不同地影响发散和会聚动力学，从而表明在聚散感觉运动控制中涉及会聚和发散的单独途径
Background: Adaptation models of the horizontal disparity vergence system assume a nonadaptable transient component. They also predict identical postadaptation dynamics during convergence and divergence movements.Method>: To test the adaptation property of the transient component, a set of experiments were performed in which closed-loop vergence dynamics measured before and after sustained convergence were compared, primarily by comparing the peak vergence velocity, occurrence time of peak vergence velocity, and steady-state vergence posture. Vergence dynamics after durations of 30, 60, and 90 s of sustained convergence were compared with those after a control duration of 5 s.Results: The peak divergence velocity was reduced by about 25% within 30 s of sustained vergence. However, the peak convergence velocity was unchanged for all the exposure durations. Additionally, for all durations, the peak divergence velocity was significantly higher than peak convergence velocity. In contrast to peak velocities, the occurrence time of peak convergence and divergence velocity did not differ significantly and remained unchanged for all durations.Conclusions: The transient component is adaptable. Furthermore, the adaptation is direction dependent and affects divergence and convergence dynamics differently, thereby suggesting involvement of separate pathways for convergence and divergence in the vergence sensorimotor control