The concept “chemical imbalance” is a vague concept, and it normally refers to having the wrong amount (too much or too little) of particular brain chemicals (called neurotransmitters) in the brain, which is believed to adversely affect one’s mood and behavior.
For example, the neurotransmitters serotonin and norepinephrine are thought to play a major role in people’s moods, such that if there is not the right balance of these chemicals in our brains, then we are susceptible to problems like depression and bipolar disorder.
Researchers say they can show this is true by comparing brain scans of healthy people with scans of depressed (or schizophrenic, etc.) people and see they are different. The problem is that these brain scans only show there’s a difference in brain chemistry between healthy brains and depressed ones; they do not show what CAUSED the difference ... Read the entire article.
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