Improving vision in adult amblyopia by perceptual learning
Improving vision in adult amblyopia by perceptual learning
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DOI：
10.1073/pnas.0401200101
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发表时间：
2004-04-27
影响因子：
11.1
通讯作者：
Sagi, D
中科院分区：
文献类型：
--
作者：
Polat, U;Ma-Naim, T;Sagi, D
练习某些视觉任务，作为一种被称为“知觉学习”的过程的结果，会显著提高表现。学习是特定于基本刺激特征的，如局部定向、视网膜位置和呈现的眼睛，这表明成年人初级视觉皮质的神经元突起发生了改变。然而，这种低水平的学习是否会影响较高水平的视觉任务，如识别，目前尚不清楚。通过对由于初级视觉皮质异常发育(导致弱视)而导致的成人视觉系统故障进行系统的低水平训练，我们在这里表明，诱导低水平的变化可能会产生显著的知觉益处，并转移到更高的视觉任务。培训程序使对比敏感度和字母识别任务提高了两倍。这些发现表明，知觉学习可以改善成人视觉系统中在关键时期没有发展起来的基本表征。
Practicing certain visual tasks leads, as a result of a process termed "perceptual learning," to a significant improvement in performance. Learning is specific for basic stimulus features such as local orientation, retinal location, and eye of presentation, suggesting modification of neuronal processes at the primary visual cortex in adults. It is not known, however, whether such low-level learning affects higher-level visual tasks such as recognition. By systematic low-level training of an adult visual system malfunctioning as a result of abnormal development (leading to amblyopia) of the primary visual cortex during the "critical period," we show here that induction of low-level changes might yield significant perceptual benefits that transfer to higher visual tasks. The training procedure resulted in a 2-fold improvement in contrast sensitivity and in letter-recognition tasks. These findings demonstrate that perceptual learning can improve basic representations within an adult visual system that did not develop during,the critical period.