The role of feedback was investigated with respect to conscious and unconscious knowledgeacquired during artificial grammar learning (AGL). After incidental learning of trainingsequences, participants classified further sequences in terms of grammaticality andreported their decision strategy with or without explicit veridical feedback. Sequences thatdisobeyed the learning structure conformed to an alternative structure. Feedback led to anincrease in the amount of reported conscious knowledge of structure (derived rules andrecollections) but did not increase its accuracy.