The key to understanding this phenomenon is to realize the fundamental role that emotion plays in memory formation.

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Men and boys with autism have fewer neurons in a part of the brain involved in memory and emotion, according to a new study by scientists at the University of California in San Diego and the MIND Institute at UC Davis.

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These grid cells create a direct, intuitively simple map of everywhere you go, basically, sending the data to your hippocampus, the seat of memory and emotion in your brain.

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Imaging studies on depressed humans show shrinkage in their hippocampus, a brain region involved in learning, memory and emotion that is also a region where much neurogenesis occurs.

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