Peripheral oculomotor training in individuals with healthy visual systems: Effects of training and training transfer.
Peripheral oculomotor training in individuals with healthy visual systems: Effects of training and training transfer.
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DOI：
10.1016/j.visres.2016.10.016
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发表时间：
2017-04
期刊：
影响因子：
1.8
通讯作者：
Bex P
中科院分区：
文献类型：
--
作者：
Rose D;Bex P
患有病理性或模拟中央视野丧失的个体可以训练使用首选视网膜位点（PRL）作为其无功能中央凹的替代品。稳定的PRL的功能益处已被充分记录，但在PRL获得或训练转移到另一个位置以响应真实或模拟疾病进展期间，对眼动适应知之甚少。在这项研究中，8名视力正常的观察者被训练在两个位置中的一个使用伪prl (pPRL)，方法是在固定目标上引导一个偏心放置的、有凝视能力的环。pPRL位置在下视野和右视野均为6.4度，在观察者之间保持平衡。训练分两期完成，每期200次，间隔一周。在两次会议之间，pPRL的位置被交换。任务表现通过注视目标周围的注视稳定性和注视目标与环中心之间距离的注视精度来量化。后者用于根据受试者的表现，通过协变环的直径来提供反馈，从而使任务更容易或更难。准确性和稳定性随着训练而显著提高，并且在每个训练地点具有可比性。性能提升保持了一个多星期，并从第一个pPRL位置转移到第二个pPRL位置。因此，带反馈的pPRL训练可以在模拟中央凹视力丧失后提供持续的、可推广的眼球运动控制改善。这些结果表明，低视力康复专家可能仅根据感觉功能优先考虑PRL训练地点，因为眼动增益相对均匀；而且，在疾病过程的早期训练可能有利于以后的适应，如果眼病进展。
Individuals with pathological or simulated central visual field loss can be trained to use a preferred retinal locus (PRL) as a substitute for their non-functioning fovea. The functional benefits of a stable PRL are well documented, but little is known about oculomotor adaptations during PRL acquisition or transfer of training to another location in response to real or simulated disease progression. In this study, eight normally-sighted observers were trained to use a pseudo-PRL (pPRL) at one of two locations by guiding an eccentrically placed, gaze-contingent ring over a fixation target. The pPRL location was 6.4 degrees in either inferior or right visual field, balanced across observers. Training was completed in two sessions of 200 hundred trials separated by a week. Between sessions, the pPRL position was switched. Task performance was quantified both in terms of gaze stability around the fixation target and gaze accuracy in terms of distance between the target and ring centers. The latter was used to provide feedback by covarying the diameter of the ring to make the task easier or harder on the basis of subject performance. Accuracy and stability significantly increased with training and was comparable at each trained location. Performance gains were retained over a week and transferred from the first to the second pPRL location. Thus, pPRL training with feedback can provide sustained, generalizable improvements in oculomotor control following simulated foveal vision loss. These results suggest that low vision rehabilitation specialists may prioritize PRL training locations based on sensory function alone, since oculomotor gains are relatively uniform; and that training early in the disease process may benefit later adaptations should eye disease progress.
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