Oculomotor changes following learned use of an eccentric retinal locus.
Oculomotor changes following learned use of an eccentric retinal locus.
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DOI：
10.1016/j.visres.2022.108126
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发表时间：
2022-12
期刊：
影响因子：
1.8
通讯作者：
Visscher, Kristina M.
中科院分区：
文献类型：
--
作者：
Vice, Jason E.;Biles, Mandy K.;Maniglia, Marcello;Visscher, Kristina M.
患有双侧中心视力丧失的人有时会产生一个新的眼球参考点，称为首选视网膜轨迹（PRL），用于固定和规划扫视眼球运动。个人如何发展和学习有效地使用PRL仍有争议;特别是，学习计划眼跳使用PRL和学习稳定周边固定在所需的位置的时间过程。在这里，我们通过研究描述眼球运动如何改变一个人学会采用偏心视网膜轨迹来解决知识的局限性。使用凝视特遣队，眼动跟踪引导的范例来模拟中央视力丧失，40名参与者通过参与眼科和视觉识别任务开发了PRL。经过12次训练后，在六个眼动指标中观察到了显着的改善，这些指标涉及学习使用PRL的不同方面：第一次扫视着陆分散，扫视重新参考，扫视精度，扫视延迟，有用试验的百分比和固定稳定性。重要的是，我们的分析允许单独检查目标固定的稳定性，分别从扫视的着陆位置的分散度和精度。这些措施解释了50%的跨学科方差的准确性。注视稳定性和扫视精度表现出很强的正相关。虽然在学习速度上没有统计学上的显著差异，但个体确实倾向于比固定稳定性更快地学习扫视精度。扫视精度也更与准确性比固定稳定的行为任务。这表明低视力的有效干预策略应该同时解决注视稳定性和扫视精确性。
People with bilateral central vision loss sometimes develop a new point of oculomotor reference called a preferred retinal locus (PRL) that is used for fixating and planning saccadic eye movements. How individuals develop and learn to effectively use a PRL is still debated; in particular, the time course of learning to plan saccades using a PRL and learning to stabilize peripheral fixation at the desired location. Here we address knowledge limitations through research describing how eye movements change as a person learns to adopt an eccentric retinal locus. Using a gaze-contingent, eye tracking-guided paradigm to simulate central vision loss, 40 participants developed a PRL by engaging in an oculomotor and visual recognition task. After 12 training sessions, significant improvements were observed in six eye movement metrics addressing different aspects involved in learning to use a PRL: first saccade landing dispersion, saccadic re-referencing, saccadic precision, saccadic latency, percentage of useful trials, and fixation stability. Importantly, our analyses allowed separate examination of the stability of target fixation separately from the dispersion and precision of the landing location of saccades. These measures explained 50% of the across-subject variance in accuracy. Fixation stability and saccadic precision showed a strong, positive correlation. Although there was no statistically significant difference in rate of learning, individuals did tend to learn saccadic precision faster than fixation stability. Saccadic precision was also more associated with accuracy than fixation stability for the behavioral task. This suggests effective intervention strategies in low vision should address both fixation stability and saccadic precision.
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