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Neuropsychol Dev Cogn B Aging Neuropsychol Cogn. 2015;22(1):106-27. doi: 10.1080/13825585.2014.894958. Epub 2014 Mar 12.

Alterations in working memory networks in amnestic mild cognitive impairment.

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1
a King's College London, Department of Neuroimaging , Institute of Psychiatry , London , UK.

Abstract

Patients with amnestic mild cognitive impairment (aMCI) show preserved or mildly impaired working memory, despite their deficits in episodic memory. We aimed to identify performance and/or neural differences between aMCI patients and matched controls on a standard working memory fMRI task. Neuropsychological assessment demonstrated aMCI impairments in verbal and visual episodic long-term memory, with intact IQ and executive function. Participants completed a standard three-level N-back task where patients were unimpaired. Functional activations in the control group were found in expected areas, including the inferior parietal lobule and dorsolateral prefrontal cortex. Group differences were found in the insula and lingual gyrus and, in a region of interest analysis, in the hippocampus. In all cases, these were caused by an absence of task-related deactivations in the aMCI group. The results are consistent with reports of failure in task-related deacivations in aMCI and could be early indications of pathology.

KEYWORDS:

N-back; fMRI; mild cognitive impairment; working memory

PMID:
24617815
DOI:
10.1080/13825585.2014.894958
[Indexed for MEDLINE]
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