/r/askscience
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How is blood tested for dopamine, serotonin, and/or norepinephrine? How are 'levels' determined; e.g. what is the actual mechanism of the test?
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If somebody a few feet away can hear your stomach "growling" through all the fat and muscle of your body, does that mean it has to be deafeningly loud INSIDE your body? Is there an actual measurement in dB that can be made?
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If I were to put someone in a functional MRI and asked them to think of a particular concept, say "Trees", and asked them to do the same thing over a number of weeks, months or years, how similar would the FRMI images be over time? How consistent are our internal conceptual models?
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