00358nas a2200121   4500000000100000000000100001008004100002260001900043100001900062700002000081245012900101490000600230       2012                            d  cDecember 2012 1 aSidney D'Mello1 aArthur Graesser00aAutoTutor and affective autotutor: Learning by talking with cognitively and emotionally intelligent computers that talk back0 v2