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通过触摸阅读盲文,招募了后侧皮层.
Yun-Fei Liu1, Brenda Rapp1, Marina Bedny1
1Johns Hopkins University, Baltimore, MD.
Journal of cognitive neuroscience
|August 16, 2023
概括
脑部成像显示,后壁皮层 (PPC) 处理盲人字拼写,区分真实单词和非单词. 这种触觉阅读系统涉及到超出基本触觉范围的特定大脑区域.
科学领域:
- 神经科学是一个神经科学.
- 认知科学 认知科学
- 感官处理 感官处理
背景情况:
- 盲人使用布莱尔字体,这是一个使用升高点的触觉阅读系统.
- 了解触觉阅读的神经机制对于认知神经科学至关重要.
- 之前的研究集中在体感官和语义处理上,但对盲文的正写处理仍然不太了解.
研究的目的:
- 为了研究与盲文阅读中的正写处理相关的大脑活动.
- 区分布莱尔特定的正写过程与低级体感官和语义反应.
- 探索后壁皮层 (PPCs) 在阅读过程中高层触觉感知中的作用.
主要方法:
- 功能性磁共振成像 (fMRI) 用于先天盲人,熟练的盲人字阅读器.
- 参与者阅读真正的单词和伪单词呈现在布莱尔字体.
- 英语盲文收缩被利用,将物理盲文长度与正写字长度分开.
主要成果:
- 在PPC中,双边上边缘回形表现出增加的活动,随着非合同词长度的增加.
- 主要体感皮层 (S1) 活动与每个盲人字单词的点数相关 (低级特征).
- 在多变量分析中,PPC对伪词与真词的激活率更高,并且在多变量分析中区分它们.
结论:
- 后壁皮质 (PPC) 参与盲文正写处理,包括字符和单词识别.
- 这些发现表明触觉正写的独特的神经基础,可能是从视觉阅读途径中调整出来的.
- 这项研究强调了大脑在适应神经资源以阅读不同感官模式方面的显著可塑性.
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