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首页> 外文期刊>Journal of cognitive enhancement >Placebo Brain Stimulation Affects Subjective but Not Neurocognitive Measures of Error Processing
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Placebo Brain Stimulation Affects Subjective but Not Neurocognitive Measures of Error Processing

机译：安慰剂脑刺激会影响主观的误差处理，而不是神经认知的措施

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The aim of this preregistered EEG study was to show how expectations about enhanced or impaired performance through transcranial stimulation affect feelings of agency and error processing. Using a single-blind experimental design, participants (N=57) were attached to a transcranial direct current stimulation (tDCS) device, and in different blocks, they were verbally instructed to expect enhanced or impaired cognitive performance, or no effects of the brain stimulation. In all cases, but unbeknownst to the participants, we used an inert sham tDCS protocol. Subsequently, we measured their response to errors on a cognitive control task. Our expectancy manipulation was successful: participants reported improved subjective performance in the enhancement compared with the impairment condition-even though objective performance was kept at a constant level across conditions. Participants reported the highest feelings of agency over their task performance in the control condition, and lowest feelings of agency in the impairment condition. The expectancy manipulation did not affect the error-related negativity (ERN) in association with incorrect responses. During the induction phase, expecting impaired versus enhanced performance increased frontal theta power, potentially reflecting a process of increased cognitive control allocation. Our findings show that verbally induced manipulations can affect subjective performance on a cognitive control task, but that stronger manipulations (e.g., through conditioning) are necessary to induce top-down effects on neural error processing.
机译：这项预注册的脑电图研究的目的是展示如何通过经颅刺激影响对代理和错误处理的感受的期望。使用单盲实验设计，将参与者（n = 57）连接到经颅直流刺激（TDCS）设备上，在不同的块中，他们被口头指示期望具有增强或受损的认知性能，或者没有大脑的影响刺激。在所有情况下，但对于参与者而言，我们都不知道，我们都使用了intert sham tdcs协议。随后，我们测量了他们对认知控制任务错误的反应。我们的预期操纵成功：参与者报告说，与损伤条件相比，增强的主观性能提高了，尽管客观性能在整个条件上保持恒定水平。参与者报告了在控制条件下的任务绩效方面的代理商感受最高，并且在损伤状况下的代理感觉最低。预期操纵与错误响应有关，不会影响与误差相关的负性（ERN）。在诱导阶段，预期受损与增强性能会提高额叶theta功率，这可能反映出认知控制分配增加的过程。我们的发现表明，口头诱导的操纵可能会影响认知控制任务上的主观性能，但是更强的操作（例如，通过条件）是对神经错误处理产生自上而下的影响所必需的。

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