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Invariance detection in the brain: Revealed in a stepwise category induction task

机译：大脑中的不变性检测：在逐步类别归纳任务中显示

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摘要

A critical sub-process of category learning is detecting the invariance between categorical members. To examine brain activation associated with invariance detection at different steps of category learning, a stepwise category induction task was used in the present study. Within each trial, three stimuli were displayed sequentially, and participants were asked to learn the target category corresponding to the invariance among stimuli. Results revealed that invariance detection activated the fronto-parietal network. However, the frontal and parietal cortices functioned differently throughout the different steps of invariance detection. The left middle frontal gyrus (BA 9) was highly activated in both steps of invariance detection, but the posterior parietal regions, especially the right superior parietal lobule (BA 7), were more active in the final step of invariance detection, reflecting increased attention to the completion of category learning and the preparation for a subsequent response. Furthermore, a psychophysiological interaction analysis (PPI) revealed increased connectivity between the left middle frontal gyrus and the bilateral parietal cortex during the final step of invariance detection. Overall, the present findings imply the necessary role of the fronto-parietal network in variance detection.
机译：类别学习的关键子过程是检测类别成员之间的不变性。为了检查在类别学习的不同步骤上与不变性检测相关的大脑激活，在本研究中使用了逐步的类别归纳任务。在每个试验中，依次显示三个刺激，并要求参与者学习与刺激之间不变性相对应的目标类别。结果表明，不变性检测激活了额顶网络。然而，在不变性检测的不同步骤中，额叶和顶叶皮质的功能不同。在不变性检测的两个步骤中，左侧中额回（BA 9）均被高度激活，但是在不变性检测的最后一步中，后壁区域，尤其是右上顶小叶（BA 7）更为活跃，这反映出人们的关注度提高完成类别学习并为后续响应做准备。此外，一项心理生理相互作用分析（PPI）显示，在不变性检测的最后一步中，左中额叶回与双侧顶叶皮层之间的连通性增加。总的来说，目前的发现暗示额顶网络在方差检测中的必要作用。

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