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The "psychobiome" is bacteria in your gut that affects how you think and act. Scientific evidence suggest that in some cases, the bacteria in your gut–your microbiome–could be tied to neurological and psychological disorders and differences, from anxiety and autism to Parkinson's and schizophrenia. The journal Science published a survey of the field and hopes to use insight into this "psychobiome" to develop treatments for depression, insomnia, and other conditions with a neurological side to them.