Poster D110, Monday, March 27, 8:00 – 10:00 am, Pacific Concourse
A tool to cooperate: dissociating peri- and interpersonal space
Ivan Patané1,2,3, Alessandro Farnè2,3,4, Frassinetti Francesca1,5; 1Department of Psychology, University of Bologna, Bologna, Italy, 2ImpAct Team, Lyon Neuroscience Research Centre, INSERM U1028, CNRS UMR5292, Lyon, France, 3UCBL, Lyon I University, Lyon, France, 4Hospices Civiles de Lyon, Neuro-immersion & Mouvement and Handicap, Lyon, France, 5Fondazione Salvatore Maugeri, Clinica del Lavoro e della Riabilitazione, IRCCS – Istituto Scientifico di Castel Goffredo, Mantua, Italy
The space around the body is termed Peripersonal (PPS) in neuroscience and Interpersonal (IPS) in social psychology. Within the debate about their origin, the prevalent idea is they share common functional characteristics. Bunking the trend, here we report a dissociation between them. To probe their plasticity we introduced a novel type of “social” long-tool-use that would modify both spaces. Reaching- and Comfort-distance tasks, designed to respectively measure PPS and IPS, were performed before and after a cooperative long-tool-use session. Participants were asked to approach a confederate and to stop themselves either at the distance they could reach the confederate (Reaching-distance task) or at the shortest distance they still felt comfortable before the confederate (Comfort-distance task). During long-tool-use session, participants and the confederate had to cooperate by using a 70 cm-long rake to retrieve objects. In two control experiments, the same procedure was adopted, except that in tool session participants used a short rake and were required to cooperate (cooperative setting) or not (neutral setting) with the confederate. Results showed the perceived IPS was reduced, as expected following a positive social interaction. By contrast, the perceived PPS toward the very same cooperative person was actually extended after use of the same long-tool. Control short-tool-use selectively reduced the IPS (when performed in the same cooperative context) or had no effect (when in a neutral context). The use of tools to perform actions in social settings allows us to report the first strong evidence that PPS and IPS underlie dissociable plastic representations.
Topic Area: PERCEPTION & ACTION: Other