Perceptual learning in motion discrimination that generalizes across motion directions
Perceptual learning in motion discrimination that generalizes across motion directions
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DOI：
10.1073/pnas.96.24.14085
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发表时间：
1999-11-23
影响因子：
11.1
通讯作者：
Liu, ZL
中科院分区：
文献类型：
--
作者：
Liu, ZL
当人类受试者辨别两个视觉刺激的运动方向时，他们的辨别力随着练习而提高。已经发现这种改进的性能是特定的：对于实践方向，并且不转移到新的运动方向。事实上，这种刺激特异性学习已经成为几乎所有知觉团队研究的标志性发现，并被用来推断大脑中的学习位点。例如，运动辨别的学习已经被推断发生在灵长类动物的视觉区域MT（内侧颞叶皮层）中，其中神经元选择性地调整到运动方向。然而，这种运动辨别任务是极其困难的，这是大多数感知学习任务的典型。当难度适度降低时，学习就会转移到新的运动方向。这一结果挑战了使用简单的视觉刺激来推断低层次视觉过程中学习轨迹的想法，并表明即使在“简单”的感知学习任务中，高层次的处理也是必不可少的。
When human subjects discriminate motion directions of two visual stimuli, their discrimination improves with practice. This improved performance has been found to be specific: to the practiced directions and does not transfer to new motion directions. Indeed, such stimulus-specific learning has become a trademark finding in almost all perceptual teaming studies and has been used to infer the loci of learning in the brain. For example, learning in motion discrimination has been inferred to occur in the visual area MT (medial temporal cortex) of primates, where neurons are selectively tuned to motion directions. However, such motion discrimination task is extremely difficult, as is typical of most perceptual learning tasks. When the difficulty is moderately reduced, learning transfers to new motion directions. This result challenges the idea of using simple visual stimuli to infer the locus of learning in low-level visual processes and suggests that higher-level processing is essential even in "simple" perceptual learning tasks.