The current issue of JCEP is dedicated to the work that was presented by keynote speakers at two recent conferences of IACEP. The first two articles stem from the XIII International Conference of IACEP held in Boston (USA), July 10 – 14, 2011.The next two articles are based on the keynotes they presented at the 2012 European Regional Conference of IACEP, which was held May 25 – 26 of this year in Geneva (Switzerland). Furthermore, the issue comprises the translation of a classical article written in 1934 by André Rey and an article written on implicit and explicit learning in people with intellectual disabilities.