论文标题
前额叶皮层指导枕腹途径中的减小尺寸变换，以分类行为
Pre-frontal cortex guides dimension-reducing transformations in the occipito-ventral pathway for categorization behaviors
论文作者
论文摘要
为了解释我们的周围环境，大脑使用视觉分类过程。当前的理论和模型表明，此过程包括不同计算的层次结构，这些计算将复杂的高维输入转换为较低维表示（即歧管），以支持多个分类行为。在这里，我们通过分析了在动态MEG源活动中反映的这些转换来检验这一假设，而个别参与者根据不同的任务积极分类相同的刺激：面部表达，面部性别，行人性别，行人性别，车辆类型。结果揭示了三个由前额叶皮层引导的转化阶段。在第1阶段（高维，50-120ms），枕骨来源代表与任务相关的和任务 - 无关紧要的刺激特征。与任务相关的特征促进了更高的腹部/背区域，而任务 - 近二元的特征在枕骨 - 颞连接处停止。在第2阶段（121-150ms），刺激特征表示形式减少到较低的歧管，然后转变为第3阶段（161-350ms）的与任务相关的分类行为的基础分类行为。
To interpret our surroundings, the brain uses a visual categorization process. Current theories and models suggest that this process comprises a hierarchy of different computations that transforms complex, high-dimensional inputs into lower-dimensional representations (i.e. manifolds) in support of multiple categorization behaviors. Here, we tested this hypothesis by analyzing these transformations reflected in dynamic MEG source activity while individual participants actively categorized the same stimuli according to different tasks: face expression, face gender, pedestrian gender, vehicle type. Results reveal three transformation stages guided by pre-frontal cortex. At Stage 1 (high-dimensional, 50-120ms), occipital sources represent both task-relevant and task-irrelevant stimulus features; task-relevant features advance into higher ventral/dorsal regions whereas task-irrelevant features halt at the occipital-temporal junction. At Stage 2 (121-150ms), stimulus feature representations reduce to lower-dimensional manifolds, which then transform into the task-relevant features underlying categorization behavior over Stage 3 (161-350ms).
