Autobiographical memory in dementia syndromes-An integrative review

Abstract

Autobiographical memory represents a defining feature of human cognition, enabling us to vividly re-experience salient events from the personal past. By mentally traversing different temporal contexts, humans can maintain an enduring sense of who we are as individuals, as well as envisaging our future goals and behaviors. The relative ease with which we engage in these endeavors, however, belies the remarkable complexity of the autobiographical memory system. Dementia syndromes offer compelling insights into the cognitive neuroarchitecture of autobiographical memory in the face of progressive neural insult to large-scale brain networks. Importantly, the atrophy profiles of many neurodegenerative disorders follow coordinated and predictable trajectories, affecting key regions implicated in episodic and semantic memory. A wealth of evidence suggests that autobiographical memory disruption is a transdiagnostic feature of dementia, yet this impairment takes many forms and arises due to differential neurocognitive disturbances. This review aims to provide a comprehensive overview of the literature on autobiographical memory in typical and atypical presentations of Alzheimer's disease, as well as younger-onset dementia syndromes such as frontotemporal dementia and primary progressive aphasia. I will demonstrate how the systematic study of autobiographical memory across dementia syndromes can constrain and inform our fundamental understanding of memory function and, in turn, stimulate new directions in how we conceptualize and assess these cognitive capacities. Consideration will further be given to clinical implications of autobiographical memory dysfunction with a view to developing targeted interventions to better support the person living with dementia. This article is categorized under: Psychology > Memory Neuroscience > Clinical Neuroscience Psychology > Brain Function and Dysfunction.

Keywords: Hippocampus; dementia; episodic memory; parietal cortex; semantic memory.