The implication, albeit a speculative one, is that those activity patterns in young adults are the foothold onto which Alzheimer's disease forms.

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The regions of the brain we tend to use in our default state when we are young are very similar to the regions where plaques form in older people with Alzheimer's disease.

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We appear to use memory systems often in our default states. This may help us to plan and solve problems. Maybe it helps us be creative. But it may also have metabolic consequences.

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It may be the normal cognitive function of the brain that leads to Alzheimer's later in life. This was not a relationship we had even considered.

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It suggests a new hypothesis and opens an avenue in exploration. By no means is it definitive.

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