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Cognitive Aging: Differential Decline Across Memory Systems
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Clinical Applications of Brain Mappin
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Presenter Author:
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| Name:
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Pegah Shirzadfar
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Author:
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Pegah Shirzadfar - Presenter
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| Affiliation 1:
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Institute for Cognitive and Brain Sciences, Shahid Beheshti University, Tehran, Iran.
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| Name 2:
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Narjes Soltani Dehaghani - Corresponding
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Institute of Medical Science and Technology, Shahid Beheshti University, Tehran, Iran. n_soltani@sbu.ac.ir
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Abstract
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Original Research
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introduction :
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Memory decline is a well-documented concomitant of aging; however, the precise manner in which this decline manifests across distinct mnemonic components—such as emotional, priming, visual short-term, working, semantic, and facial memory—within an integrated memory system remains poorly understood. Elucidating the architecture of these components is critical for delineating the interactions among memory systems and their interplay with broader cognitive domains, including attention, executive function, learning, and language.
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Methods:
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This review synthesizes evidence from lifespan cohort studies that employ theoretically grounded cognitive paradigms. We focus on three major classes of experimental measures prevalent in cognitive aging research: (1) affective memory paradigms using standardized valenced stimuli, (2) visual short-term memory tasks assessing storage capacity and representational fidelity, and (3) tip-of-the-tongue procedures examining semantic and phonological retrieval. These approaches enable the dissection of shared and system-specific mnemonic mechanisms across the adult lifespan.
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Results:
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Evidence from lifespan studies consistently supports a multi-system architecture of memory. Associative and item memory demonstrate pronounced age-related decline, whereas implicit memory, as indexed by priming, remains relatively preserved. Notably, age-related alterations in visual short-term memory are better characterized not by a reduction in the quantity of items stored, but by a degradation in the precision or quality of retained representations, reflecting diminished allocation of a finite cognitive resource. Visual short-term memory and lexical retrieval tasks reveal selective vulnerabilities in storage capacity, representational precision, and phonological access with advancing age. Critically, these differential trajectories persist after controlling for cohort effects (e.g., educational attainment) and general cognitive decline indexed by fluid intelligence. Further analyses substantiate that memory components exhibit distinct profiles of sensitivity to aging, rather than conforming to a singular, global pattern of decline.
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Conclusion:
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Collectively, the reviewed evidence indicates that memory aging is characterized by the differential engagement of partially dissociable memory systems. Age-related memory decline does not constitute a unitary deterioration but arises from system-specific mechanisms, each yielding distinct behavioral and cognitive signatures. Consequently, integrative, lifespan-informed approaches are indispensable for refining theoretical models of memory organization and for elucidating the trajectories of change across distinct memory systems throughout adulthood.
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| Attachment:
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| Keywords:
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Memory systems- Cognitive aging- Lifespan cognition
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| Key message:
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