Like other brain stem responses—and unlike those of the autonomic nervous system, such as the rate at which the heart beats—the startle reflex lies beyond the range of voluntary regulation. So far as brain science understands, the mechanisms that control the startle reflex cannot be modified by any intentional act…The bigger a person’s startle, the more strongly that individual tends to experience negative emotions. View article at shambhalasun.com.
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This article also mentions testing done on a group of regular ‘ol stressed out Americans taught to meditate. Same shift in frontal lobe activity! Yippee for us!
http://www.dharmalife.com/issue21/joydetectives.html