Integrative Model-based Cognitive Neuroscience Research Unit, University of Amsterdam, 1018 WS, The Netherlands.
Integrative Model-based Cognitive Neuroscience Research Unit, University of Amsterdam, 1018 WS, The Netherlands.
Neuropsychologia. 2019 Feb 18;124:226-235. doi: 10.1016/j.neuropsychologia.2018.12.009. Epub 2018 Dec 13.
Studies that aim to understand the neural correlates of response conflicts commonly probe frontal brain areas associated with controlled inhibition and decision processes. However, untimely fast conflict errors happen even before these top-down processes are engaged. The dual-route model proposes that during conflict tasks, as soon as the stimulus is presented, two early processes are immediately at play. The task-relevant and task-irrelevant processes generate either compatible responses, when all stimulus features align, or incompatible responses, when stimulus features are in conflict. We aimed to find a neural substrate of these two processes by means of relating the quality of the representation of stimulus features in visual and somatosensory brain areas to responses in conflict tasks. Participants were scanned using fMRI while performing somatosensory and visual Simon tasks. The fMRI data were then analysed using a MVPA in early visual and somatosensory cortices. In agreement with our hypotheses, results suggest that the sensory representation of the task-relevant and task-irrelevant features drive erroneous trials. These results demonstrate that traces of response conflicts can arise already in sensory brain areas and that the quality of the representations in these regions can account for an early response capture by irrelevant stimulus features.
研究旨在理解反应冲突的神经相关性，通常会探测与控制抑制和决策过程相关的额叶脑区。然而，即使在这些自上而下的过程被激活之前，不合时宜的快速冲突错误也会发生。双通路模型提出，在冲突任务中，一旦刺激呈现，两个早期过程立即发挥作用。当所有刺激特征一致时，任务相关和任务无关的过程产生兼容的反应，而当刺激特征冲突时，产生不兼容的反应。我们旨在通过将视觉和体感脑区中刺激特征的表示质量与冲突任务中的反应相关联，找到这两个过程的神经基础。参与者在执行体感和视觉 Simon 任务时接受 fMRI 扫描。然后，使用 MVPA 在早期视觉和体感皮层中分析 fMRI 数据。与我们的假设一致，结果表明，任务相关和任务无关特征的感觉表示驱动错误试验。这些结果表明，反应冲突的痕迹可能已经出现在感觉脑区，并且这些区域中的表示质量可以解释无关刺激特征对早期反应的捕获。
