n300 and social affordances a study with a real person and a dummy as stimulin300和社会功能的研究与一个真正的人,一个虚拟的刺激.pdfVIP

N300 and Social Affordances: A Study with a Real Person and a Dummy as Stimuli J. Bruno Debruille1,2,3*, Mathieu B. Brodeur1,2, Carolina Franco Porras4 ´ ´ ´ ´ 1 Douglas Mental Health University Institute, Montreal, Quebec, Canada, 2 Department of Psychiatry, McGill University, Montreal, Quebec, Canada, 3 Department of ´ ´ Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada, 4 Centre d’Higiene Mental Les Corts, Barcelona, Spain Abstract Pictures of objects have been shown to automatically activate affordances, that is, actions that could be performed with the object. Similarly, pictures of faces are likely to activate social affordances, that is, interactions that would be possible with the person whose face is being presented. Most interestingly, if it is the face of a real person that is shown, one particular type of social interactions can even be carried out while event-related potentials (ERPs) are recorded. Indeed, subtle eye movements can be made to achieve an eye contact with the person with minimal artefacts on the EEG. The present study thus used the face of a real person to explore the electrophysiological correlates of affordances in a situation where some of them (i.e., eye contacts) are actually performed. The ERPs this person elicited were compared to those evoked by another 3D stimulus: a real dummy, and thus by a stimulus that should also automatically activate eye contact affordances but with which such affordances could then be inhibited since they cannot be carried out with an object. The photos of the person and of the dummy were used as matching stimuli that should not activate social affordances as strongly as the two 3D sti