The Monoamine Theory: The Biological Theory Of Depression

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Depression is a chronic, cognitive illness characterized by a prolonged state of melancholy coupled with helplessness and continued pessimism. This illness is initiated by numerous situations including traumatic experience or simply a valuable loss, causing neurological, emotional and physical changes. Depressive patients are unable to continue life as normal due to constant fear of the future mirroring past experiences. Research and investigation are constantly conducted in this area of health and there are many avenues of treatment provided by health professionals today. Biological theory of depression First proposed by Schildkraut in 1965, was one of the main biological theories explaining depression, currently known as the ‘Monoamine Theory’. This theory suggests that depression is caused by dysfunction of the monoamine transmitters in the brain, resulting in a shortage of monoamines including 5-hydroxytryptamine (5-HT) and noradrenaline. ‘It is based on the ability of known antidepressants drugs to facilitate monoaminergic transmission, and of drugs such as reserpine to cause depression.’ (Rang and Dale’s Pharmacology) The hypothesis originated from the clinical connection between the drug used to alleviate symptoms and the neurological effects these drugs have on monoamine transmitters in the brain. This pharmacological evidence somewhat supports the monoamine theory but also contains several inconsistencies. The search for more direct evidence, including the investigation of the monoamine metabolism of depressives has become futile as inconsistent results are obtained and causes are not narrowed to depression. Supporting the theory is the amount of 5 HT detected by its metabolites in cerebrospinal fluid, urine and plasma... ... middle of paper ... ...fs in the earlier theory of ‘learned helplessness’. The reformulated model states: ‘…investigators of human helplessness have become increasingly disenchanted with the adequacy of theoretical constructs…so have we. …We do not know whether these considerations apply to infra-humans’ Seligman’s group admit that their decade in of research in the animal model failed to address the fundamental aspect of human depression. Their second model was primarily based on the “attribution theory” which expounds the human connection between ‘causality’ and ‘events’. The reformulated theory concludes that humans suffering melancholy make internal attributions for lamentable events and are pessimistic towards the future. This model now being a ‘hypothetical construct’ can only be used as an introduction into human depression treatment with deeper research needing to be validated.

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