Heading perception in patients with advanced retinitis pigmentosa
Heading perception in patients with advanced retinitis pigmentosa
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DOI：
10.1097/00006324-200209000-00009
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发表时间：
2002-09-01
影响因子：
1.4
通讯作者：
Warren, WH
中科院分区：
文献类型：
--
作者：
Li, L;Peli, E;Warren, WH
目的。我们研究了残留视野< 10度的视网膜色素变性（RP）患者是否能从光流中感知头部。方法。四名RP患者和四名年龄匹配的正常视力对照受试者观看模拟观察者在地面上行走的显示器。在实验1中，受试者在自由注视下观看整个显示器（全场条件）或通过一个注视点位于中心的孔（孔径条件）。在实验2中，患者观看不同持续时间的显示。结果。RP患者的表现与年龄匹配的对照组相当，全视野条件下的头球判断优于孔径条件。将显示时间从0.5秒增加到1秒可以提高患者的头球性能，但给他们更多的时间（3秒）来收集更多的视觉信息并不能持续地进一步提高他们的性能。结论。RP患者使用主动扫描眼动来补偿其头球知觉的视野损失；他们可能能够在大约15秒内收集到足够的光流信息来进行航向感知。
Purpose. We investigated whether retinis pigmentosa (RP) patients with residual visual field of < 10degrees could perceive heading from optic flow. Methods. Four RP patients and four age-matched normally sighted control subjects viewed displays simulating an observer walking over a ground. in experiment 1, subjects viewed either the entire display with free fixation (full-field condition) or through an aperture with a fixation point at the center (aperture condition). in experiment 2, patients viewed displays of different durations. Results. RP patients' performance was comparable to that of the age-matched control subjects: heading judgment was better in the full-field condition than in the aperture condition. Increasing display duration from 0.5 s to 1 s improved patients' heading performance, but giving them more time (3 s) to gather more visual information did not consistently further improve their performance. Conclusions. RP patients use active scanning eye movements to compensate for their visual field loss in heading perception; they might be able to gather sufficient optic flow information for heading perception in about 1 s.