 At Carnegie Mellon, he subsequently completed his PhD under the supervision of James McClelland in 1991, on modelling of implicit sequence learning by means of artificial neural networks.Thereafter he returned to the Université Libre de Bruxelles, where he worked as a Senior Research Assistant for two years, before becoming head of the Cognitive Science Research Unit in 1993 (currently Consciousness, Cognition & Computation Group), as a Research Associate funded by the National Fund for Scientific Research (currently as Research Director).In 2001-2002 he spent a year as a visiting scholar at the University of Colorado at Boulder.