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首页> 外文期刊>Neuropsychologia >Temporal dynamics of action perception: Differences on ERP evoked by object-related and non-object-related actions
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Temporal dynamics of action perception: Differences on ERP evoked by object-related and non-object-related actions

机译：动作知觉的时间动态：与对象有关和与非对象有关的动作引起的ERP差异

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While neuropsychological dissociations suggest that distinct processes are involved in execution or perception of transitive (object-related) and intransitive (non-object-related) actions, the few neuroima-ging studies that directly contrasted the brain activations underlying transitive and intransitive gesture perception failed to find substantial differences between the two action types. However, the distinction could be visible on brain activity timing within the fronto-parietal network. In this study, we used Event-Related Potential (ERP) method to assess the temporal dynamics of object-related and non-object-related action processing. Although both meaningful, only object-related actions involve object motor features. Accordingly, perception of the two action types would show distinct neural correlates. Participants were presented with four movie types (ORA, Object-Related Action, NORA: Non-Object-Related Action and 2 control movies) and were instructed to perform tasks that required explicit or implicit action recognition (specific action recognition or color change detection). Movies were presented as Point-Light Display (PLD) and thus provided only information about gesture kinematics regardless of action type. ERP were computed during movie visual perception and analyzed as a function of movie type and task. The main result revealed a difference between ORA and NORA on the amplitude of the P3a component in the fronto-parietal region. The difference observed around 250 ms after movie onset do not likely origin from variation in low-level visual features or attention resource allocation. Instead, we suggest that it reflects incidental recruitment of object attributes during object-related action perception. The exact nature of these attributes is discussed.
机译：尽管神经心理学的解离表明，传递或与（与对象无关）动作的执行或感知涉及不同的过程，但很少有神经生物学研究直接与传递与与和不传递手势感知的脑部活动进行对比找出两种动作类型之间的实质差异。但是，这种区别在额顶网络内的大脑活动时间上是显而易见的。在这项研究中，我们使用事件相关电位（ERP）方法来评估对象相关和非对象相关动作处理的时间动态。尽管两者都有意义，但只有对象相关的动作才涉及对象运动特征。因此，对两种动作类型的感知将显示出明显的神经相关性。向参与者展示了四种影片类型（ORA，与对象相关的动作，NORA：与对象无关的动作和2部控制影片），并指示他们执行需要显式或隐式动作识别（特定动作识别或颜色变化检测）的任务。 。电影以点光源显示器（PLD）的形式呈现，因此无论动作类型如何，都仅提供有关手势运动学的信息。在电影视觉感知期间计算ERP，并根据电影类型和任务对其进行分析。主要结果揭示了ORA和NORA之间在额顶区P3a分量的幅度上存在差异。电影开始后约250毫秒观察到的差异不太可能源于低级视觉特征或注意力资源分配的变化。相反，我们建议它反映在对象相关的动作感知过程中对象属性的偶然募集。讨论了这些属性的确切性质。

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