As a visual neuroscientist, we know that photographs are extremely powerful cues for the memory system. And I believe there's some work on this that if people keep a photograph of something that draws positive memories that that photograph actually can be a positive cue for alleviating stress and just enhancing mood. So measuring levels of the nervous system and how vigilant we are is another way that we can understand stress. The stress response uses a tremendous amount of energy, ATP, that's made by our mitochondria. If we have that kind of vigilant stress response on all day, we're just going to feel exhausted.

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