Unwanted or invasive thoughts

Some promising research on the neurochemistry of stopping unwanted invasive thoughts: http://www.sciencealert.com/scientists-might-have-found-the-chemical-that-suppresses-unwanted-thoughts-in-the-brain  

A study suggest that people with OCD have difficulty learning to differentiate safe vs unsafe stimuli on a neurological level: http://www.sciencealert.com/this-could-explain-why-people-with-ocd-can-t-overcome-their-urges?utm_source=ScienceAlert+-+Daily+Email+Updates&utm_campaign=6edad9e60e-MAILCHIMP_EMAIL_CAMPAIGN&utm_medium=email&utm_term=0_fe5632fb09-6edad9e60e-365490661