Matthew Hartley Jacqueline Fagard Rana Esseily John Taylor Observational Versus Trial and Error Effects in a Model of an Infant Learning Paradigm. 277-289 2008 ICANN (2) http://dx.doi.org/10.1007/978-3-540-87559-8_29 conf/icann/2008-2 db/conf/icann/icann2008-2.html#HartleyFET08