The POLEXP network co-hosted the Fourth International Meeting on Experimental and Behavioral Social Sciences (IMEBESS), co-organized with the Nuffield Centre for Experimental Social Sciences of the University of Oxford (CESS) and the Political Science Department at the University of Barcelona. 180 researchers attended the event, held at the UB Parc for the Social Sciences and Humanities. Over the course of three days, experimental research on human behaviour in various fields was discussed.