知觉学习强化V1神经元的显著性地图
其他题名Perceptual learning enhances saliency map in monkey V1
Yin Yan; Li Zhaoping; Wu Li
2016
会议名称2016年第一届北京视觉科学会议
会议日期2016-07
会议地点北京
会议主办者中国科学院心理研究所
其他摘要

PURPOSE:  A salient feature contrast between a target item and many background items results in perceptual pop-out of the target from the background. However, when the feature contrast is small the target may not be salient initially, but sufficient training on the detection task can also result in a pop-out e?ect. Previous studies suggest that the pop-out effect induced by simple feature contrast is mediated by primary visual cortex (V1) through creating a saliency map, which is thought to be a bottom-up process. In the current study we examine whether the saliency map in V1 can be enhanced by perceptual learning.
METHODS: Two monkeys were trained to detect a line segment whose orientation was deviated by varying extents from a background of iso-oriented lines. Over the course of training we recorded V1 neuronal responses with implanted microelectrode arrays. We used support-vector-machine (SVM) classifier to decode V1 responses.
RESULTS: The animals' performance in the detection task, measured as percent correct and reaction time, was signi?cantly improved with training for targets with small orientation contrasts. By comparing neurons with different preferred orientations relative to the target, we dissociated two distinct neural response components that signal the pop-out e?ect. One component is stimulus-driven and little affected by training; it relies on orientation-dependent contextual modulation mechanisms, which create a saliency map from neural response outset. The other component is mainly task- and experience-dependent; it signals the perceptual saliency of the target, independent of the preferred orientations of neurons. The latter mechanism generates a delayed saliency map (40 ms after visual response onset), which is enhanced by perceptual training and correlated with improved behavioral performance.
CONCLUSIONS: V1 is involved in detection of local-feature contrast through two separate saliency maps. Perceptual learning enhances the late saliency map but not the early, bottom-up, saliency map.

关键词Pop-out V1 Perceptual learning   
学科领域感知觉心理学
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语种英语
文献类型会议论文
条目标识符http://ir.psych.ac.cn/handle/311026/20779
专题心理所主办学术会议_2016年第一届北京视觉科学会议_会议摘要
作者单位1.State Key Laboratory of Cognitive Neuroscience and Learning, IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing 100875, China
2.Department of Computer Science, University College London, London WC1E 6BT, UK
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Yin Yan; Li Zhaoping; Wu Li. 知觉学习强化V1神经元的显著性地图[J]. 心理科学进展, 2016, 24(Suppl.): 1-1.
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