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Title: 时间模式在知觉学习信息加工过程中的作用
Author: 蒯曙光
Degree Level: 博士
Issued Date: 2009-04-27
Degree Grantor: 中国科学院上海生命科学研究院
Place of Degree Grantor: 上海生命科学研究院
Supervisor: 余聪
Keyword: 视觉 ; 知觉学习 ; 时间模式 ; 信息编码
Alternative Title: Effects of temporal patterning on stimulus coding of perceptual learning
Major: 神经生物学
Abstract: 知觉学习可以提高人对视觉刺激的属性(如对比度、方位和视敏度)的辨别能力。近二十年来,由于对脑可塑性的关注和对发育缺陷病人治疗的需要,知觉学习逐渐成为研究的热点。以往的研究更多地关注知觉学习的结果所存储的脑区,而对其信息加工的过程知之甚少。本研究采用多刺激混合学习的范式,讨论了知觉学习的信息加工过程。我们发现:1)在多刺激混合的知觉学习中,固定的时间模式(固定的时间模式和固定的任务间时间间隔)相比随机的时间模式更能促进学习的发生。2)在随机的时间模式下,即使延长刺激呈现时间或者呈现与参照刺激一样的刺激作为提示,都不能抵消随机的时间模式所造成的影响。但是,如果呈现与刺激参数建立对应关系的字母作为提示,则能够促进知觉学习的发生。3)时间模式对知觉学习的影响主要发生在学习效果未巩固时,一旦学习效果得到巩固,时间模式就不能破坏已获得的效果。此外,在固定的时间模式下获得的学习效果可以在其它的时间模式下提取出来。这些结果说明,在多刺激混合的知觉学习过程中,大脑需通过固定的时间模式在概念水平上对刺激进行标识,当不同的刺激条件切换时,大脑依次把注意调整到与刺激相匹配的决策模板上,提高该模板的权重,改进知觉决策的效率。
English Abstract: Perceptual learning improves discrimination of visual features, such as contrast, orientation and spatial frequency, which has been studied intensively in recent years because of its close links to brain plasticity. Past studies for perceptual learning have focused on what we learn to understand the neural representations of learning, while few studies involve information processing during the learning. In this study, we used the multi-stimulus training paradigm to investigate the stimulus coding rules for perceptual learning. We found (1) In contrast with roving, the fixed temporal pattern (fixed stimulus sequence and fixed inter-stimulus intervals) could enable the multi-stimulus perceptual learning. (2) The effect of stimulus roving could not be counteracted by extending the duration of stimulus presentation or presenting physical cues prior to the roving stimulus. On the contrary, the conceptual letter cues associated with stimuli restored learning during the roving. (3) Stimulus roving only disrupted the learning when the memory traces had not been consolidated. Once established learning was resistant, it could be retrieved regardless of the stimulus temporal conditions. Our results suggest that during multi-stimulus perceptual learning, stimulus sequence may tag each stimulus at a conceptual level, so that visual system can switch attention to the appropriate perceptual template during learning.
Language: 中文
Content Type: 学位论文
URI: http://ir.sibs.ac.cn/handle/331001/2367
Appears in Collections:神经所(总)_学位论文

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Recommended Citation:
时间模式在知觉学习信息加工过程中的作用.蒯曙光[d].中国科学院上海生命科学研究院,2009.20-25
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