Intriguing: Abdominal muscle contraction would occur in animals involved in fight or flight (sympathetic response) as would pupillary dilation in order to see more. Relaxation (think rest, digestion, orgasm, & bladder & bowel evacuation) is a parasympathetic response; associated with reduced pupillary dilation. So is not so much one causes other, but that these effects would be aligned. Very interesting.
Answered 12/9/2013
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