Reading direct speech quotes increases theta phase-locking: Evidence for cortical tracking of inner speech?
Reading direct speech quotes increases theta phase-locking: Evidence for cortical tracking of inner speech?
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DOI：
10.1016/j.neuroimage.2021.118313
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发表时间：
2021-06
期刊：
影响因子：
5.7
通讯作者：
Bo Yao;Jason R. Taylor;B. Banks;S. Kotz
中科院分区：
文献类型：
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作者：
Bo Yao;Jason R. Taylor;B. Banks;S. Kotz
越来越多的证据表明，听觉皮层中的θ波段（4-7 Hz）活动与公开讲话的节奏相锁定。θ波活动是否也编码了内部言语的节奏动力？先前的研究表明，无声阅读直接引语（例如，玛丽说：“这件衣服真漂亮！”）比间接引语更生动的内部引语（例如，玛丽说这件衣服很漂亮）。由于我们不能直接跟踪θ活动和内部语言之间的相位对齐，我们使用EEG来测量大脑对阅读开始的锁相反应。我们发现，直接（与间接）引用阅读与增加θ相位同步超过试验在250-500毫秒后阅读发作，在语音处理网络中估计的诱发活动的来源。眼动追踪控制实验证实，直接引用阅读中增加的θ相位同步不是由眼动模式驱动的，更可能反映了内部言语开始时的同步相位重置。这些发现表明，θ相位调制在阅读诱导的内部言语的功能作用。
Growing evidence shows that theta-band (4–7 Hz) activity in the auditory cortex phase-locks to rhythms of overt speech. Does theta activity also encode the rhythmic dynamics of inner speech? Previous research established that silent reading of direct speech quotes (e.g.,Mary said: “This dress is lovely!”) elicits more vivid inner speech than indirect speech quotes (e.g.,Mary said that the dress was lovely). As we cannot directly track the phase alignment between theta activity and inner speech over time, we used EEG to measure the brain's phase-locked responses to the onset of speech quote reading. We found that direct (vs. indirect) quote reading was associated with increased theta phase synchrony over trials at 250–500 ms post-reading onset, with sources of the evoked activity estimated in the speech processing network. An eye-tracking control experiment confirmed that increased theta phase synchrony in direct quote reading was not driven by eye movement patterns, and more likely reflects synchronous phase resetting at the onset of inner speech. These findings suggest a functional role of theta phase modulation in reading-induced inner speech.