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首页> 外文期刊>Experimental Brain Research >The occluded onset pursuit paradigm: prolonging anticipatory smooth pursuit in the absence of visual feedback.
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The occluded onset pursuit paradigm: prolonging anticipatory smooth pursuit in the absence of visual feedback.

机译：封闭的发作追踪范例：在没有视觉反馈的情况下延长预期的平稳追踪。

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摘要

Humans can produce anticipatory smooth pursuit (ASP) for a few hundred ms prior to the appearance of a moving target. Once visual feedback is available, however, it is difficult to distinguish ASP from the visually-driven response with which it merges. Here we have developed a paradigm that extends the anticipatory period to show unequivocally how ASP can evolve over periods of up to 600 ms before being influenced by visual feedback. ASP was evoked by repeated presentation of constant velocity (ramp) stimuli preceded by auditory cues. The target was occluded during the initial part of the ramp, so that when it became visible it had already moved to an eccentric position. The occlusion period (T (occ)) varied from 0 to 500 ms in 100 ms increments; for each period ramps were presented in blocks of 8 with velocity held constant at 8, 16, 24 or 32 degrees /s. Eye displacement trajectories showed that subjects attempted to match the unseen target trajectory with a mixture of saccades and smooth pursuit. Thesmooth component was initiated progressively earlier in relation to target appearance as T (occ) increased, leading to progressively higher ASP gains by the time the target became visible. This prolongation of ASP throughout the occlusion period reveals the underlying internal drive that produces it, a drive that under normal circumstances quickly becomes masked by visual feedback.
机译：在出现移动目标之前，人类可以产生预期的平稳追踪（ASP）几百毫秒。但是，一旦有了视觉反馈，就很难将ASP与合并的视觉驱动响应区分开。在这里，我们开发了一个范式，它扩展了预期周期，以明确显示ASP在受视觉反馈影响之前如何在长达600 ms的时间内演化。通过反复呈现恒定速度（斜坡）刺激和听觉提示来诱发ASP。在坡道的初始阶段，目标被遮挡，因此当它变得可见时，它已经移动到了偏心位置。遮挡时间段（T（occ））从0到500 ms以100 ms为增量变化。每个周期的斜率以8的块表示，速度保持恒定在8、16、24或32度/ s。眼睛位移轨迹表明，受试者试图通过扫视和平稳追击来匹配看不见的目标轨迹。随着T（occ）的增加，平滑组件相对于目标外观而言逐渐开始启动，导致目标变得可见时，ASP逐渐升高。在整个阻塞期间，ASP的这种延长揭示了产生它的潜在内部驱动力，这种驱动力在正常情况下会很快被视觉反馈所掩盖。

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