Garrido-Vásquez Patricia, Wengemuth Eileen, Schubö Anna
Department of Psychology, University of Concepción, Chile.
Department of Experimental and Biological Psychology, Philipps University Marburg, Germany.
Heliyon. 2021 Apr 24;7(4):e06870. doi: 10.1016/j.heliyon.2021.e06870. eCollection 2021 Apr.
Object affordance refers to possibilities to interact with the objects in our environment, such as grasping. Previous research shows that objects that afford an action activate the motor system and attract attention, for example they elicit an enhanced frontal negativity and posterior P1 in the event-related potential. An effect on posterior N1 is discussed. However, previous findings might have resulted from physical differences between affording and non-affording stimuli, rather than affordance . Here we replicated the frontal negativity and posterior P1 effects and further explored the posterior N1 in affordance processing under constant visual input. An ambiguous target was primed either with an affording (pencils) or non-affording (trees) context. Although physically always identical, the target elicited an enhanced frontal negativity and posterior P1 in the pencil prime condition. Posterior N1 was reduced and grip aperture in a grasping task was smaller in the affording context. Source localization revealed stronger activation in occipital and parietal regions for targets in pencil versus tree prime trials. Thus, we successfully show that an ambiguous object primed with an affording context is processed differently than when primed with a non-affording context. This could be related to the ambiguous object acquiring a potential for action through priming.
物体可供性是指与我们环境中的物体进行交互的可能性，例如抓取。先前的研究表明，具有某种动作可供性的物体能够激活运动系统并吸引注意力，例如在事件相关电位中它们会引发增强的额叶负波和后部P1波。也有关于后部N1波受影响的讨论。然而，先前的研究结果可能是由于具有可供性和不具有可供性的刺激之间的物理差异导致的，而非可供性本身的作用。在这里，我们重复了额叶负波和后部P1波的效应，并在恒定视觉输入条件下进一步探究了可供性加工中的后部N1波。一个模糊的目标分别由具有可供性的（铅笔）或不具有可供性的（树木）背景进行启动。尽管目标在物理上始终相同，但在铅笔启动条件下，目标引发了增强的额叶负波和后部P1波。在具有可供性的背景下，后部N1波减小，并且在抓取任务中的抓握孔径也更小。源定位显示，与树木启动试验相比，铅笔启动试验中的目标在枕叶和顶叶区域有更强的激活。因此，我们成功地表明，由具有可供性的背景启动的模糊物体与由不具有可供性的背景启动时的加工方式不同。这可能与模糊物体通过启动获得了一种动作潜力有关。
