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Modern civilization is incredibly stimulus impoverished, especially the educational settings we provide for children. One interpretation of ADD is that certain brains are tuned to have higher thresholds for driving bottom up attention. The result of this is that in a 'normal' educational environment all stimuli fall well below the threshold for engagement so attention jumps all over the place because there is no signal strong enough to hold it. Now, take that same brain out into the woods and let it wander around and look at things and explore and where the 'normal' brain is overwhelmed by the sound of the wind in the leaves and the patterns of light on the forest floor the ADD mind sees the footprints of the deer and the outline of a grouse.

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