Divergence eye movements are dependent on initial stimulus position
Divergence eye movements are dependent on initial stimulus position
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DOI：
10.1016/j.visres.2005.01.017
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发表时间：
2005-06-01
期刊：
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;Semmlow, JL;Pedrono, C
之前关于会聚和发散眼球运动的速度和潜伏期的研究得出了不同的结果，有时甚至是相互矛盾的。对4名受试者进行研究，跟踪不同初始目标位置的4度视差阶跃变化，以求收敛和发散。在这里，我们报告了发散运动的动力学不仅不同于收敛运动，而且取决于初始收敛位置。发散眼球运动对最初靠近对象的目标的反应速度大约是对最初较远的目标反应的两倍，并且也表现出较短的时间特性。因此，尽管收敛响应与初始位置无关，但发散动态和时间特性取决于初始刺激位置。据推测，散度的差异可能是眼外肌的非线性特性的结果，或者潜在的神经控制器的不同，可能是融合起始发散分量的大小不同。(C)2005爱思唯尔有限公司。保留所有权利。
Previous studies on the speed and latency of convergence and divergence eye movements have produced varied, sometimes contradictory, results. Four subjects were studied and tracked 4 degrees disparity step changes for convergence and divergence at different initial target positions. Here we report that the dynamics of divergence movements not only differ from convergence movement, but depend on the initial vergence position. Velocities of divergence eye movements in response to targets that were initially near to the subject were approximately twice that of responses to initially distant targets and also exhibited shorter temporal properties. Hence, while convergence responses are fairly similar irrespective of the initial position, divergence dynamic and temporal properties are dependent on the initial stimulus position. It is speculated that the differences observed in divergence may be the result of nonlinear properties of the extraocular muscles or a difference in the underlying neural controller potentially a difference in the magnitude of the fusion initiating component of divergence. (c) 2005 Elsevier Ltd. All rights reserved.