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IN PRESS: Psychological Review
AbstractOne of the most extensively investigated topics in the adult memory literature, dual memory processes, has had virtually no impact on the study of early memory development. We remove the key obstacles to such research by formulating a trichotomous theory of recall that combines the traditional dual processes of recollection and familiarity with a reconstruction process. The theory is then embedded in a hidden Markov model that measures all three processes with low-burden tasks that are appropriate for even young children. These techniques are applied to a large corpus of developmental studies of recall, yielding stable findings about the emergence of dual memory processes between childhood and young adulthood and generating tests of many theoretical predictions. The techniques are extended to the study of healthy aging and to the memory sequelae of common forms of cognitive impairment, resulting in a theoretical framework that is unified over four major domains of memory research: early development, mainstream adult research, aging, and cognitive impairment. The techniques are also extended to recognition, creating a unified dual-process framework for recall and recognition.Keywords: memory development, dual memory processes, aging, cognitive impairment, hidden Markov models Trichotomous Processes in Early Memory Development, Aging, and Cognitive Impairment:A Unified Theory This paper has three objectives. The first is to resolve a fundamental problem in memory development research; the second is to apply that solution to a large corpus of developmental studies of recall; and the third is to extend the solution to memory changes that occur during healthy aging and in certain forms of cognitive impairment. The problem in question is the scant impact that dual-process distinctions have had on the study of early (child-to-young-adult) memory development. The result is a dramatic disparity in knowledge about dual memory processes in adults, which is vast, versus knowledge about how those processes first evolve, which is thin and inconsistent. Our solution, as will be seen, is (a) to propose a trichotomous theory of recall that subsumes traditional dual-process distinctions, (b) to implement that theory in a low-burden family of tasks that are appropriate for even very young children, and (c) to show that a new mathematical model of those tasks can be used to measure the development of trichotomous memory processes and to test theoretical predictions about them. Concerning the second objective, we show that an attractive feature of this solution is that a developmental data base exists that can be analyzed with the model, thereby closing the gap in knowledge about early memory development. With respect to the third objective, unlike early development, the study of memory changes during aging and in cognitive impairment have been strong...