Successful auditory motor adaptation requires task-relevant auditory errors
Successful auditory motor adaptation requires task-relevant auditory errors
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DOI：
10.1152/jn.00662.2018
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发表时间：
2019-08-01
影响因子：
2.5
通讯作者：
Dittman, Jonathan
中科院分区：
文献类型：
--
作者：
Daliri, Ayoub;Dittman, Jonathan
当我们产生言语动作时，我们也预测了动作的听觉后果。我们利用预测和传入的听觉信息之间的差异来修改我们未来的动作（适应）。虽然听觉错误对言语运动学习至关重要，但并非所有感知到的听觉错误都是我们自己行为的结果。因此，大脑需要评估感知的听觉错误的相关性。在这项研究中，我们研究了错误评估过程中涉及的听觉运动适应系统操纵之间的对应关系的言语运动输出和他们的听觉后果在说话。参与者（n = 30）在接受干扰听觉反馈（例如，产生“头”，但听到一个听起来像“有”的词）。在一种情况下，听觉错误与参与者的生产（任务相关的错误）。在另一种情况下，听觉错误由实验者定义，与参与者的语音输出（任务无关的错误）没有对应关系。我们发现，与任务相关的听觉错误的条件下，与任务无关的听觉错误的条件相比，适应的程度和错误敏感性（来自状态空间模型）更大。另外。具有较小感知目标（来自分类感知任务）的被试对听觉扰动的适应性更强，而具有较大感知目标的被试对听觉扰动的适应性更弱。同样，具有较小感知目标的被试对任务相关听觉错误条件下的错误更敏感。总之，我们的研究结果突出了复杂的机制，涉及感知和生产系统，大脑用来最佳地整合听觉错误，成功的言语运动学习。新&值得注意的反馈监测是必不可少的准确的言语生产。通过提供实证结果和计算框架，我们表明：1）大脑评估听觉错误的相关性，并对相关错误做出更多的反应，2）较小的感知目标与对错误的敏感性和更多的听觉运动适应相关。
When we produce speech movements, we also predict the auditory consequences of the movements. We use discrepancies between our predictions and incoming auditory information to modify our future movements (adapt). Although auditory errors arc crucial for speech motor learning, not all perceived auditory errors are consequences of our own actions. Therefore, the brain needs to evaluate the relevance of perceived auditory errors. In this study, we examined error assessment processes involved in auditory motor adaptation by systematically manipulating the correspondence between speech motor outputs and their auditory consequences during speaking. Participants (n = 30) produced speech while they received perturbed auditory feedback (e.g.. produced "head" but heard a word that sounded like "had" ). In one condition, auditory errors were related to participants' productions (task-relevant errors). In another condition, auditory errors were defined by the experimenter and had no correspondence with participants' speech output (task-irrelevant errors). We found that the extent of adaptation and error sensitivity (derived from a state-space model) were greater in the condition with task-relevant auditory errors compared with those in the condition with task-irrelevant auditory errors. Additionally. participants with smaller perceptual targets (derived from a categorical perception task) adapted more to auditory perturbations, and participants with larger perceptual targets adapted less. Similarly, participants with smaller perceptual targets were more sensitive to errors in the condition with task-relevant auditory errors. Together, our results highlight the intricate mechanisms, involving both perception and production systems, that the brain uses to optimally integrate auditory errors for successful speech motor learning.NEW & NOTEWORTHY Feedback monitoring is essential for accurate speech production. By providing empirical results and a computational framework, we show that 1) the brain evaluates relevance of auditory errors and responds more to relevant errors, and 2) smaller perceptual targets are associated with more sensitivity to errors and more auditory motor adaptation.