Rambold Holger, Sander Thurid, Sprenger Andreas, Helmchen Christoph
Department of Neurology, University of Luebeck, Luebeck, Germany.
Ann N Y Acad Sci. 2009 May;1164:440-3. doi: 10.1111/j.1749-6632.2008.03724.x.
Low gain of the smooth-pursuit system causes correcting saccades that are clinically observed as "saccadic pursuit." In contrast, low gain of the vergence system during tracking does not appear to cause "saccadic tracking." To further evaluate whether this clinical observation is caused by a missing interaction of vergence to step and ramp targets, vergence eye movements to step-ramp, step, and ramp targets in 3-dimensional space were tested. Results show that vergence to a step and a ramp stimulus is additive in the step-ramp paradigm, indicating no interaction of both components.
平稳跟踪系统增益较低会导致校正性扫视，在临床上表现为“扫视跟踪”。相比之下，跟踪过程中聚散系统增益较低似乎不会导致“扫视跟踪”。为了进一步评估这种临床观察结果是否是由于聚散对阶跃和斜坡目标缺乏相互作用所致，对三维空间中聚散眼球运动对阶跃-斜坡、阶跃和斜坡目标进行了测试。结果表明，在阶跃-斜坡范式中，对阶跃和斜坡刺激的聚散是相加的，表明这两个成分之间没有相互作用。
