Brain
There are dozens of other chemical neurotransmitters that are used in more limited areas of the brain, often areas dedicated to a particular function. Serotonin, for example—the primary target of antidepressant drugs and many dietary aids—comes exclusively from a small brainstem area called the raphe nuclei. Norepinephrine, which is involved in arousal, comes exclusively from a nearby small area called the locus coeruleus. Other neurotransmitters such as acetylcholine and dopamine have multiple sources in the brain, but are not as ubiquitously distributed as glutamate and GABA.
Deepak Chopra
Chopra argues that everything that happens in the mind and brain is physically represented elsewhere in the body, with mental states (thoughts, feelings, perceptions and memories) directly influencing physiology by means of neurotransmitters such as dopamine, oxytocin and serotonin. He has stated, "Your mind, your body and your consciousness – which is your spirit – and your social interactions, your personal relationships, your environment, how you deal with the environment, and your biology are all inextricably woven into a single process … By influencing one, you influence everything."