期刊
JOURNAL OF ALZHEIMERS DISEASE
卷 57, 期 3, 页码 735-745出版社
IOS PRESS
DOI: 10.3233/JAD-160772
关键词
Alzheimer's disease; cognition; early diagnosis; neuroimaging; risk; visual perception
资金
- National Institute on Aging [RO1AG038471]
- National Institute of Neurological Disorders and Stroke [RO1NS078828]
- National Institute of Mental Health [T32MH064913]
- Howard Hughes Medical Institute [HHMI MIG 56006779]
Early detection may be the key to developing therapies that will combat Alzheimer's disease (AD). It has been consistently demonstrated that one of the main pathologies of AD, tau, is present in the brain decades before a clinical diagnosis. Tau pathology follows a stereotypical route through the medial temporal lobe beginning in the entorhinal and perirhinal cortices. If early pathology leads to very subtle changes in behavior, it may be possible to detect these changes in subjects years before a clinical diagnosis can currently be made. We aimed to discover if cognitively normal middle-aged adults (40-60 years old) at increased risk for AD due to family history would have impaired performance on a cognitive task known to challenge the perirhinal cortex. Using an oddity detection task, we found that subjects with a family history of AD had lowered accuracy without demonstrating differences in rate of acquisition. There were no differences between subjects' medial temporal lobe volume or cortical thickness, indicating that the changes in behavior were not due to significant atrophy. These results demonstrate that subtle changes in perceptual processing are detectable years before a typical diagnosis even when there are no differences detectable in structural imaging data. Anatomically-targeted cognitive testing may be useful in identifying subjects in the earliest stages of AD.
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