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首页> 外文期刊>The European Journal of Neuroscience >Transcranial magnetic stimulation of right inferior parietal cortex causally influences prefrontal activation for visual detection
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Transcranial magnetic stimulation of right inferior parietal cortex causally influences prefrontal activation for visual detection

机译：右下间皮层的经颅磁性刺激因果性地影响前额叶激活的视觉检测

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Abstract For effective interactions with the environment, the brain needs to form perceptual decisions based on noisy sensory evidence. Accumulating evidence suggests that perceptual decisions are formed by widespread interactions amongst sensory areas representing the noisy sensory evidence and frontoparietal areas integrating the evidence into a decision variable that is compared to a decisional threshold. This concurrent transcranial magnetic stimulation (TMS )fMRI study applied 10込 bursts of fourTMS (or Sham) pulses to the intraparietal sulcus (IPS ) to investigate the causal influence ofIPS on the neural systems involved in perceptual decisionmaking. Participants had to detect visual signals at threshold intensity that were presented in their left lower visual field on 50% of the trials. Critically, we adjusted the signal strength such that participants failed to detect the visual stimulus on approximately 30% of the trials allowing us to categorise trials into hits, misses and correct rejections (CR). Our results show thatIPS relative to ShamTMS attenuated activation increases for misses relative to CR in the left middle and superior frontal gyri. Critically, whileIPS TMS did not significantly affect participants performance accuracy, it affected how observers adjusted their response times after making an error. We therefore suggest that activation increases in superior frontal gyri for misses relative to correct responses may not be critical for signal detection performance, but rather reflect postdecisional processing such as metacognitive monitoring of choice accuracy or decisional confidence.
机译：摘要对于与环境的有效互动，大脑需要基于嘈杂的感官证据形成感知决策。积累证据表明，感知决定是通过涉及嘈杂的感官证据和前部迁移到与判决阈值相比的决策变量的嘈杂感官证据和前部迁徙区域的感官区域之间的普遍互动形成。这种并发经颅磁刺激（TMS）FMRI研究施加了10‰的四吨（或假）脉冲到内部硫磺（IPS），以研究对感知作出决策中涉及的神经系统的因果影响。参与者必须以阈值强度检测视觉信号，在其左下视野上以50％的试验中呈现的阈值强度。批判性地，我们调整了信号强度，使参与者未能检测到大约30％的试验中的视觉刺激，允许我们将试验分类为命中，但未命中和正确的拒绝（CR）。我们的结果表明，相对于Shamtms衰减激活的Z，相对于左侧中间圆形吉尔蒂的CR相对于Cr的遗传增加而增加。批判性地，TMS没有显着影响参与者的性能准确性，它影响了观察者在发出错误后如何调整响应时间。因此，我们表明，相对于正确响应的卓越额相Gyri的激活增加可能对信号检测性能不重要，但相当反映出岗位处理，例如选择精度或决策信心的元认知监测。

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