Bertonatti Matias, Weymar Mathias, Sommer Werner, Fischer Martin H
Institut für Psychologie, Humboldt-Universität zu Berlin, Germany.
Department of Biological Psychology and Affective Science, Faculty of Human Sciences, University of Potsdam, Germany.
J Cogn. 2021 Mar 10;4(1):21. doi: 10.5334/joc.148.
Two experiments were conducted to determine, first, whether food items influence participants' estimations of the size of their subjective peripersonal space. It was of particular interest whether this representation is influenced by satiated/hungry states and is differentially affected by valence and calorie content of depicted stimuli. Second, event-related brain potentials (ERPs) were used, in order to obtain information about the time course of the observed effects and how they depend on the spatial location of the food pictures. For that purpose, participants had to decide whether food items shown at various distances along a horizontal plane in front of them, were reachable or not. In Experiment 1, when participants were hungry, they perceived an increase of their peripersonal space modulated by high-calorie items which were experienced as being more reachable than low-calorie items. In Experiment 2, the reachability findings were replicated and early and late components of ERPs showed an attentional enhancement in far space for food items when participants were hungry. These findings suggest that participants' subjective peripersonal space increased while being hungry, especially for high-calorie contents. Attention also seems to be oriented more strongly to far space items due to their expected incentive-related salience, expanding the subjective representation of peripersonal space.
进行了两项实验，首先是为了确定食物项目是否会影响参与者对其主观个人空间大小的估计。特别令人感兴趣的是，这种表征是否受到饱腹/饥饿状态的影响，以及所描绘刺激的效价和卡路里含量是否会对其产生不同的影响。其次，使用了事件相关脑电位（ERP），以便获取有关观察到的效应的时间进程以及它们如何依赖于食物图片的空间位置的信息。为此，参与者必须判断在他们面前水平面上不同距离处显示的食物项目是否能够够到。在实验1中，当参与者饥饿时，他们会感觉到高热量食物调节了他们的个人空间增加，高热量食物比低热量食物更容易够到。在实验2中，重复了可及性的研究结果，并且当参与者饥饿时，ERP的早期和晚期成分显示出对远处空间中食物项目的注意力增强。这些发现表明，参与者在饥饿时主观个人空间会增加，特别是对于高热量食物。由于预期的与奖励相关的显著性，注意力似乎也更强烈地指向远处空间的项目，从而扩大了个人空间的主观表征。
