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The concentration of serotonin receptors normally varies markedly among individuals. Those whose brain scans showed the most receptor activity proved on personality tests to have the strongest proclivity to spiritual acceptance.
Reporting in the American Journal of Psychiatry, the researchers see the evidence as contradicting the common belief that religious behavior is determined strictly by environmental and cultural factors. They see a biological underpinning for religiosity, and it is related to the neurotransmitter serotonin.
Research paper here
http://ajp.psychiatryonline.org/cgi/con ... f_ipsecsha
So, religious belief and spirituality are as valid as hallucinations from LSD... all the hallucinating gits
