In the brain, nerve cells provide communication between the body and the brain itself. Every time you move, feel the wind on your face, hear a voice, recall a memory, information moves along or between neurons. It will therefore come as no surprise that sleep, good nutrition, smoking, drinking, sports, and your environment influence health. These are often elements that are discussed during an investigation.

Neurotransmitters are substances that ensure the communication between nerve cells. After all, nerve cells are not attached to each other. There is a small gap in between. A signal passes from one nerve cell to another nerve cell via specific molecules: neurotransmitters and neuromodulators. Some of the most important are: serotonin, norepinephrine, dopamine and acetylcholine and GABA. Wat minder bekend is dat een groot aantal processen in de hersenen ontregeld zijn omdat het functioneren van zg. neurotransmitters is ontregeld, en de balans tussen deze neurotransmitters en de neuromodulators is verstoord. Er kunnen er bijvoorbeeld te weinig of teveel in de neuronen zijn opgeslagen, de neuronen geven teveel af, de natuurlijke afbraak verloopt niet goed, of andere moleculen bezetten de receptoren van de neurotransmitters. Deze verstoringen kunnen verschillende oorzaken hebben.