WHAT CAUSES CENTRAL NERVOUS SYSTEM DISORDERS?

Depression seems to be caused by low levels of neurotransmitters that involve norepinephrine and serotonin circuits in the brain.

Neurons are the building blocks of the brain. Neurons, the nerve cells that are the major constituent of the brain, are in many ways the most remarkable cells in all of biology. The basic job of the neuron is to process information and convey it to other neurons in the brain and ultimately, to generate behavior and experience. Neurons talk to each other by releasing certain chemical molecules, the chemical messengers, or neurotransmitters, at the synapses. When these neurotransmitters are imbalanced or low, especially serotonin (a specific neurotransmitter), depression occurs.

Serotonin, in particular, has been the neurotransmitter subjected to intense research for the past 25 years.