Chris Fields Why do we talk to ourselves? 255-272 2002 14 J. Exp. Theor. Artif. Intell. 4 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=0952-813x&volume=14&issue=4&spage=255 db/journals/jetai/jetai14.html#Fields02