Brainlab - Cognitive Neuroscience Research Group, Department of Clinical Psychology and Psychobiology, University of Barcelona, Barcelona, Spain.
Institute of Neurosciences, University of Barcelona, Barcelona, Spain.
Sci Rep. 2021 May 27;11(1):11121. doi: 10.1038/s41598-021-86996-4.
The visual pathway is retinotopically organized and sensitive to gaze position, leading us to hypothesize that subjects using visual prostheses incorporating eye position would perform better on perceptual tasks than with devices that are merely head-steered. We had sighted subjects read sentences from the MNREAD corpus through a simulation of artificial vision under conditions of full gaze compensation, and head-steered viewing. With 2000 simulated phosphenes, subjects (n = 23) were immediately able to read under full gaze compensation and were assessed at an equivalent visual acuity of 1.0 logMAR, but were nearly unable to perform the task under head-steered viewing. At the largest font size tested, 1.4 logMAR, subjects read at 59 WPM (50% of normal speed) with 100% accuracy under the full-gaze condition, but at 0.7 WPM (under 1% of normal) with below 15% accuracy under head-steering. We conclude that gaze-compensated prostheses are likely to produce considerably better patient outcomes than those not incorporating eye movements.
视觉通路是视网膜定位的，并且对注视位置敏感，这使我们假设，使用结合眼动的视觉假体的受试者在感知任务上的表现将优于仅通过头部引导的设备。我们让有视力的受试者通过模拟人工视觉，在完全注视补偿和头部引导观察的条件下，从 MNREAD 语料库中阅读句子。通过 2000 个模拟光幻视，受试者（n=23）立即能够在完全注视补偿下阅读，评估的等效视敏度为 1.0 logMAR，但在头部引导观察下几乎无法完成任务。在测试的最大字体大小 1.4 logMAR 下，受试者在完全注视条件下以 59 WPM（正常速度的 50%）和 100%的准确率阅读，但在头部引导条件下以 0.7 WPM（低于正常速度的 1%）和低于 15%的准确率阅读。我们得出结论，与不包含眼球运动的假体相比，具有注视补偿功能的假体可能会产生更好的患者效果。
