Serotonin in the Brain

Having enough serotonin is critical to life.

Serotonin interacts with every other neurotransmitter in the brain.  However only one millionth of all the neurotransmitters are serotonin.  Low serotonin is a medical condition not a diminished mental capacity.

"...serotonergic neurons project in rich profusion to every part of the central nervous system (the brain and spinal cord), where they influence the activity of virtually every neuron. This widespread influence implies that the serotonergic neurons play a fundamental role in the integration of behavior. Our sense of well-being and our capacity to organize our lives and to relate to others depend profoundly on the functional integrity of the serotonergic system."

My Brain Notes on Serotonin