Subtle changes in the human brain constitute a third element in addition to plaques and tangles as markers of vulnerability to Alzheimer's disease (AD). Neurofibrillary tangle (NFT) distribution shows the closest relationship to the severity of dementia. Two features of the distribution (regional selectivity and columnar clustering) provide clues about the structural changes due to normal ageing that may precede tangle formation. It is hypothesized that the columnar organization of the cortex...Expand abstract
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Subtle changes in the ageing human brain.
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