Current Alzheimer Research

Prof. Debomoy K. Lahiri  
Department of Psychiatry, Indiana University School of Medicine
Neuroscience Research Center
Indianapolis, IN 46202
USA

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Hippocampal Morphology and Autobiographic Memory in Mild Cognitive Impairment and Alzheimer’s Disease

Author(s): Philipp A. Thomann, Ulrich Seidl, Julia Brinkmann, Dusan Hirjak, Tanja Traeger, R. Christian Wolf, Marco Essig and Johannes Schröder

Affiliation: Section of Geriatric Psychiatry, University of Heidelberg, Voß-Str. 4, 69115 Heidelberg, Germany

Keywords: Alzheimer’s disease, Autobiographical memory, Hippocampus, Magnetic resonance imaging, Mild cognitive impairment

Abstract:

Autobiographical memory (AM) comprises memories of one’s own past that are characterized by a sense of subjective time and autonoetic awareness. AM deficits are among the major complaints of patients with Alzheimer’s disease (AD) even in early or preclinical stages. However, little is known on the association between cerebral alterations and AM in mild cognitive impairment (MCI) and AD. In the current study, patients with AD or MCI and healthy controls underwent high-resolution magnetic resonance imaging (MRI) and neuropsychological testing including semi-structured assessment of semantic and episodic AM of distinct lifetime periods. In MRI analysis, FSL-FIRST was used to automatically ascertain volume and shape of the hippocampal formation. Episodic, but not semantic AM loss was associated with morphological changes of the hippocampus, primarily involving the left hemisphere. According to shape analyses, these associations referred to regionally specific rather than global atrophy of the hippocampus. Our study demonstrates that loss of episodic AM early in the course of AD is associated with regionally confined hippocampal atrophy, thus supporting the multiple trace theory for the role of the hippocampus in episodic AM. Our findings are not only relevant for the understanding of memory function, but may also contribute to facilitating the early diagnosis of AD.

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Article Details

VOLUME: 9
Page: [1 - 9]
Pages: 9
DOI: