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The biology of depression is the attempt to identify a biochemical origin of depression, as opposed to theories that emphasize psychological or situational causes. Scientific studies have found that different brain areas show altered activity in humans with major depressive disorder (MDD) . [ 1 ]
Depression due to physical illness is diagnosed as a mood disorder due to a general medical condition. This condition is determined based on history, laboratory findings, or physical examination . When the depression is caused by a medication, non-medical use of a psychoactive substance, or exposure to a toxin , it is then diagnosed as a ...
[12] [13] [14] One interpretation is that depression manifests due to an imbalance of neurotransmitters in the brain, resulting in feelings of worthlessness and despair. Magnetic resonance imaging shows that the brains of people diagnosed with depression may have a hippocampus up to 10% smaller than those who do not exhibit signs of depression.
The exact cause of catatonic depression is not fully understood. [1] However, it is believed to arise from a complex interplay of genetic, biochemical, and environmental factors. Some research suggests that disturbances in neurotransmitters like dopamine and gamma-aminobutyric acid (GABA) may contribute to the development of catatonic symptoms. [2]
There may also be imbalances in mood-regulating neurotransmitters (brain chemicals) like dopamine and serotonin. But this isn’t well understood, either. But this isn’t well understood, either.
The biological model of abnormality (the only model not based on psychological principles) is based on the assumptions that if the brain, neuroanatomy and related biochemicals are all physical entities and work together to mediate psychological processes, then treating any mental abnormality must be physical/biological.
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