Kourtis Dimitrios, Vingerhoets Guy
Department of Experimental Psychology, Ghent University, Henri Dunantlaan 2, 9000 Ghent, Belgium.
Department of Experimental Psychology, Ghent University, Henri Dunantlaan 2, 9000 Ghent, Belgium.
Biol Psychol. 2015 Sep;110:138-47. doi: 10.1016/j.biopsycho.2015.07.017. Epub 2015 Aug 3.
We examined the feature saliency and prehensile/motor affordance effects that are visually elicited by a graspable object's most salient features and graspable part, respectively. EEG was recorded from participants who attended a photo of an object, and responded to a left- or right-pointing arrow, which was overlaid on the object 1000 ms after object onset. Analysis of response times demonstrated the presence of a feature saliency effect. Lateralization of posterior alpha suppression showed that attention was initially directed to the object's (most salient) functional end. Pre-movement frontocentral beta suppression and the modulation of the P3 component showed that a response compatible to the functional end was activated before arrow onset. Moreover, lateralization of pre-movement posterior and central alpha suppression indicated a behaviorally masked affordance effect. This suggests that the two effects may occur independently, but without specific attention orienting instructions, the feature saliency effect dominates a potential prehensile affordance effect.
我们分别研究了可抓握物体最显著特征和可抓握部分在视觉上引发的特征显著性和抓握/运动可供性效应。记录了观看物体照片并对在物体出现1000毫秒后叠加在物体上的向左或向右指示箭头做出反应的参与者的脑电图。反应时间分析表明存在特征显著性效应。后部阿尔法抑制的侧化表明注意力最初指向物体的（最显著的）功能端。运动前额中央贝塔抑制和P3成分的调制表明，在箭头出现之前，与功能端兼容的反应就被激活了。此外，运动前后部和中央阿尔法抑制的侧化表明存在行为上掩盖的可供性效应。这表明这两种效应可能独立发生，但在没有特定注意力定向指令的情况下，特征显著性效应主导了潜在的抓握可供性效应。
