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The serotonin "chemical imbalance" theory of depression, proposed in the 1960s, [38] is not supported by the available scientific evidence. [ 38 ] [ 39 ] SSRIs alter the balance of serotonin inside and outside of neurons: their clinical antidepressant effect (which is robust in severe depression [ 40 ] ) is likely due to more complex changes in ...
While depression is a complex condition with many factors involved, it is commonly attributed to an imbalance of several key monoamine neurotransmitters, including serotonin, dopamine and norepinephrine. This monoamine hypothesis of depression is popular because of the simplicity of the explanation. [4]
Shortly after Schildkraut's catecholamine hypothesis was published, Coppen proposed that 5-HT, rather than NA, was the more important neurotransmitter in depression. This was based on similar evidence to that which produced the NA theory as reserpine, imipramine, and iproniazid affect the 5-HT system, in addition to the noradrenergic system.
The neurotrophic hypothesis of depression [1] proposes that major depressive disorder (MDD) is caused, at least partly, by impaired neurotrophic support.Neurotrophic factors (also known as neurotrophins) are a family of closely related proteins which regulate the survival, development, and function of neurons in both the central and peripheral nervous systems.
The pharmacology of antidepressants is not entirely clear.. The earliest and probably most widely accepted scientific theory of antidepressant action is the monoamine hypothesis (which can be traced back to the 1950s), which states that depression is due to an imbalance (most often a deficiency) of the monoamine neurotransmitters (namely serotonin, norepinephrine and dopamine). [1]
In neurophysiology, long-term depression (LTD) is an activity-dependent reduction in the efficacy of neuronal synapses lasting hours or longer following a long patterned stimulus. LTD occurs in many areas of the CNS with varying mechanisms depending upon brain region and developmental progress.
Behavior therapies for depression first emerged in the mid-1960s with Saslow's positive group reinforcement, which focused on increasing social skills. Three alternative therapies emerged over the next 4 years: Lewinsohn's social learning theory, Patterson's anti-depression milieu, and Lazarus' behavioral deprivation.
The triad forms part of his cognitive theory of depression [4] and the concept is used as part of CBT, particularly in Beck's "Treatment of Negative Automatic Thoughts" (TNAT) approach. The triad involves "automatic, spontaneous and seemingly uncontrollable negative thoughts" about the self , the world or environment , and the future.
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