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首页> 外文期刊>neuroscience of consciousness >Revealing subthreshold motor contributions to perceptual confidence
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Revealing subthreshold motor contributions to perceptual confidence

机译：揭示阈下运动对知觉信心的贡献

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abstract_textpEstablished models of perceptual metacognition, the ability to evaluate our perceptual judgements, posit that perceptual confidence depends on the strength or quality of feedforward sensory evidence. However, alternative theoretical accounts suggest the entire perception-action cycle, and not only variation in sensory evidence, is monitored when evaluating confidence in ones percepts. Such models lead to the counterintuitive prediction that perceptual confidence should be directly modulated by features of motor output. To evaluate this proposal here we recorded electromyographic (EMG) activity of motor effectors while subjects performed a near-threshold perceptual discrimination task and reported their confidence in each response in a pre-registered experiment. A subset of trials exhibited subthreshold EMG activity in response effectors before a decision was made. Strikingly, trial-by-trial analysis showed that confidence, but not accuracy, was significantly higher on trials with subthreshold motor activation. These findings support a hypothesis that preparatory motor activity, or a related latent variable, impacts upon confidence over and above performance, consistent with models in which perceptual metacognition integrates information across the perception-action cycle./p/abstract_text
机译：已建立的知觉元认知模型，即评估我们的知觉判断的能力，假设知觉信心取决于前馈感官证据的强度或质量。然而，其他理论解释表明，在评估对知觉的信心时，整个感知-行动周期，而不仅仅是感官证据的变化，都会受到监控。这些模型导致了违反直觉的预测，即知觉信心应该直接由运动输出的特征调节。为了评估这一提议，我们记录了运动效应器的肌电图（EMG）活动，同时受试者执行了接近阈值的知觉辨别任务，并在预先注册的实验中报告了他们对每个反应的信心。在做出决定之前，一部分试验在反应效应器中表现出阈下肌电图活性。引人注目的是，逐项试验分析表明，在阈下运动激活的试验中，可信度（但不是准确性）明显更高。这些发现支持了一个假设，即准备运动活动或相关的潜在变量对信心的影响超过了表现，这与知觉元认知在整个感知-行动周期中整合信息的模型一致。

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