Increased blood flow detected by fMRI scans?

[Mark D. Morin]

Andrew Gyles wrote:
> 
> Blood oxygen level dependent functional magnetic resonance imaging (BOLD
> fMRI) scans show active regions of the brain. It has been assumed that the
> excess of oxygen detected in an active region is brought there by increased
> blood flow.
> 
> Has this assumption of increased blood flow been proved correct by
> experiment?
> 
> Andrew Gyles

Experiments don't prove any hypothesis, they simply support
or reject the hypothesis.

Do you have an alternative hypothesis that could be tested?
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