title: Temporal Stability of Implicit Sequence Knowledge: Implications for Single-system Models of Memory.
abstract: Previous research has shown that explicit and implicit knowledge of artificial grammars may decay at different rates (e.g., Tamayo & Frensch, 2007; Tunney, 2003). We extend these findings to sequential regularities embedded in serial reaction time (SRT) tasks. We compared the forgetting patterns of implicit and explicit knowledge after a retention interval of 7 days without rehearsal. Explicit knowledge decayed after 7 days, whereas implicit knowledge was retained. These data were modeled according to the assumptions involved in the single-system model suggested by Shanks, Wilkinson, and Channon (2003). The best fit for the model was obtained by modifying the parameters related to (a) the common knowledge-strength variable for implicit and explicit knowledge, and (b) reliability of the explicit test. We interpret these dissociations as a boundary condition for single-system models that assume constant random noise to explain dissociations in the forgetting patterns of implicit and explicit sequential knowledge.
authors.affiliation: 1 Universidad Nacional de Colombia, Bogota, Colombia.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Tamayo
authors.affiliation: 2 Humboldt-Universität zu Berlin, Germany.
authors.forename: Peter A
authors.initials: PA
authors.lastname: Frensch
mesh_terms: D005260:Female; D006801:Humans; D019359:Knowledge; D008297:Male; D008568:Memory / Q000502:physiology*; D011930:Reaction Time
keywords: functional dissociation; implicit learning; implicit memory; priming; recognition; single-system models