Manual dexterity and phonological decoding involve the posterior parietal cortex, which controls location coding for visually guided actions, as well as a large fronto-cerebellar network. We studied the relationship between manual dexterity and reading ability in adult typical readers. Two measurements of manual dexterity were collected to index the procedural learning effect. A linear regression model demonstrated that phonological short-term memory, manual dexterity at time 1 and procedural learning of manual dexterity predicted phonological decoding speed. Similar results were found when left-hand dexterity at time 1 and procedural learning dexterity were entered last. The better one’s phonological decoding skill was, the less fluent their manual dexterity was, suggesting a recycle from object–location to letter–location coding. However, the greater the procedural learning, the faster phonological decoding was, suggesting that larger plasticity of object–location coding was linked to better letter–location coding. An independent role of the interhemispheric connections or of the right posterior parietal cortex is also suggested.

手动灵巧性和语音解码涉及后顶叶皮层，它控制视觉引导动作的位置编码，以及大型额小脑网络。我们研究了成人典型读者的手巧程度与阅读能力之间的关系。收集了两个手动灵巧度的测量值来衡量程序学习效果。线性回归模型表明，语音短期记忆、时间 1 的手巧度和手巧度的程序学习预测了语音解码速度。在时间 1 的左手灵巧度和程序学习灵巧度最后输入时，发现了类似的结果。一个人的语音解码技能越好，他们的手巧就越不流畅，这表明从对象-位置到字母-位置编码的循环。然而，程序学习越大，语音解码越快，这表明对象位置编码的更大可塑性与更好的字母位置编码有关。还建议了半球间连接或右后顶叶皮层的独立作用。