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Old 06-02-2008, 05:29 PM
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Many years ago I did a stint in a neurobiology research lab. This was when brain imaging with FMRI to detect brain activation was a pretty new thing. It has probably progressed quite a bit since then.

The researcher I designed equipment for told me that they were looking for changes on the order of one half of one percent in blood flow for the parts of the brain that were being activated.