The ACT-R theory (Anderson, 1993; Anderson & Lebiere, 1998) is applied to the list memory paradigms of serial recall, recognition memory, free recall, and implicit memory. List memory performance in ACT-R is determined by the level of activation of declarative chunks which encode that items occur in the list. This level of activation is in turn determined by amount of rehearsal, delay, and associative fan from a list node. This theory accounts for accuracy and latency profiles in backward and

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... rward serial recall, set size effects in the Sternberg paradigm, length-strength effects in recognition memory, the Tulving-Wiseman function, serial position, length and practice effects in free recall, and lexical priming in implicit memory paradigms. This wide variety of effects is predicted with minimal parameter variation. It is argued that the strength of the ACT-R theory is that it offers a completely specified processing architecture that serves to integrate many existing models in the literature. ᭧ 1998 Academic Press Address reprint requests to John R. Anderson, Depart-domains. Different subdomains involve differment of Psychology, Carnegie Mellon University, Pittsent aspects of cognition-memory for serial burgh, PA 15213. E-mail: ja/@cmu.edu. order, free recall strategies, structure of lexical We thank Chris Schunn for his comments on this manumemory, etc. Therefore, it is natural that descript.