Laboratoire Parole et Langage, Centre National de La Recherche Scientifique, Aix-Marseille Université, Aix-en-Provence, France.
Cortex. 2022 Jul;152:21-35. doi: 10.1016/j.cortex.2022.03.013. Epub 2022 Apr 12.
During speaking or listening, endogenous motor or exogenous visual processes have been shown to fine-tune the auditory neural processing of incoming acoustic speech signal. To compare the impact of these cross-modal effects on auditory evoked responses, two sets of speech production and perception tasks were contrasted using EEG. In a first set, participants produced vowels in a self-paced manner while listening to their auditory feedback. Following the production task, they passively listened to the entire recorded speech sequence. In a second set, the procedure was identical except that participants also watched online their own articulatory movements. While both endogenous motor and exogenous visual processes fine-tuned auditory neural processing, these cross-modal effects were found to act differentially on the amplitude and latency of auditory evoked responses. A reduced amplitude was observed on auditory evoked responses during speaking compared to listening, irrespective of the auditory or audiovisual feedback. Adding orofacial visual movements to the acoustic speech signal also speeded up the latency of auditory evoked responses, irrespective of the perception or production task. Taken together, these results suggest distinct motor and visual influences on auditory neural processing, possibly through different neural gating and predictive mechanisms.
在说话或倾听过程中，已经证明内源性运动或外源性视觉过程可以微调传入的言语声信号的听觉神经处理。为了比较这些跨模态效应对听觉诱发反应的影响，我们使用 EEG 对比了两组言语产生和感知任务。在第一组中，参与者以自我调节的方式发出元音，同时听他们的听觉反馈。在产生任务之后，他们被动地听整个记录的言语序列。在第二组中，程序相同，只是参与者还在线观看自己的发音运动。虽然内源性运动和外源性视觉过程都可以微调听觉神经处理，但这些跨模态效应对听觉诱发反应的幅度和潜伏期有不同的影响。与听觉反馈无关，与说话相比，听觉诱发反应的幅度在说话时会减小。将口面部视觉运动添加到言语信号中也会缩短听觉诱发反应的潜伏期，与感知或产生任务无关。总的来说，这些结果表明听觉神经处理受到不同的运动和视觉影响，可能通过不同的神经门控和预测机制。
