· just now. Report Abuse. Emotions aren't caused by one specific chemical in the brain. There are a number of neurotransmitters, or chemicals in the brain that perform different functions and carry impulses from one part of the brain to the other.Some of these include serotonin, dopamine, acetylcholine, epinephrine, norepinephrine, GABA, etc.hese parts of the brain are the hardware, the chemicals that they use as communicators may be considered as being our software. Emotions are neuropeptides attaching to receptors and stimulating an electrical change on neurons.