Downing Paul E, Peelen Marius V, Wiggett Alison J, Tew Bryn D
University of Wales, Bangor, Gwynedd, UK.
Soc Neurosci. 2006;1(1):52-62. doi: 10.1080/17470910600668854.
Numerous cortical regions respond to aspects of the human form and its actions. What is the contribution of the extrastriate body area (EBA) to this network? In particular, is the EBA involved in constructing a dynamic representation of observed actions? We scanned 16 participants with fMRI while they viewed two kinds of stimulus sequences. In the coherent condition, static frames from a movie of a single, intransitive whole-body action were presented in the correct order. In the incoherent condition, a series of frames from multiple actions (involving one actor) were presented. ROI analyses showed that the EBA, unlike area MT + and the posterior superior temporal sulcus, responded more to the incoherent than to the coherent conditions. Whole brain analyses revealed increased activation to the coherent sequences in parietal and frontal regions that have been implicated in the observation and control of movement. We suggest that the EBA response adapts when succeeding images depict relatively similar postures (coherent condition) compared to relatively different postures (incoherent condition). We propose that the EBA plays a unique role in the perception of action, by representing the static structure, rather than dynamic aspects, of the human form.
许多皮层区域会对人体形态及其动作的各个方面产生反应。外侧膝状体体区（EBA）对这个神经网络有什么贡献呢？特别是，EBA是否参与构建所观察动作的动态表征？我们让16名参与者在观看两种刺激序列时进行功能磁共振成像扫描。在连贯条件下，以正确顺序呈现来自单个非传递性全身动作影片的静态画面。在不连贯条件下，呈现来自多个动作（涉及一名演员）的一系列画面。感兴趣区分析表明，与MT +区和颞上沟后部不同，EBA对不连贯条件的反应比对连贯条件的反应更强。全脑分析显示，在与运动观察和控制有关联的顶叶和额叶区域，对连贯序列的激活增加。我们认为，与相对不同的姿势（不连贯条件）相比，当后续图像描绘相对相似的姿势（连贯条件）时，EBA的反应会发生变化。我们提出，EBA通过表征人体形态的静态结构而非动态方面，在动作感知中发挥独特作用。
