The other piece of the puzzle is that OCD is associated  with low levels of serotonin, a neurotransmitter  that communicates between brain structures and helps regulate vital processes, such as mood, aggression, impulse control, sleep, appetite,  body temperature and pain.
Drugi dio slagalice je da je OKP povezan s niskim razinama serotonina, neurotransmitera koji komunicira između struktura mozga i pomaže regulirati vitalne procese kao što su raspoloženje, agresija, kontrola impulsa, spavanje, apetit, tjelesna temperatura i bol.