Additionally, this theory uses elements based on byproduct theories and balance theories. This theory then goes further and states that as a result of this grouping, humans that have specific genes replaced groups that lacked those genes. Ī third theory relating to schizophrenia is group selection theory which describes 'psychosis' alleles provide advantages to groups, outweighing any disadvantages. Folklore accounts mention wise fools and clever madmen but do not connect such a characteristic to motifs combining psychosis and creativity, aspects believed to be borne from schizophrenia. Though an evolutionary theory in its own, analysis of balance theory does not show this route as a possibility. These benefits yield valued personality traits or yet again shamanism a desired and mystic ability of the past. Īnother evolutionary theory which connects with the development of modern-day schizophrenia are Balance theories which hypothesizes that schizophrenia's negative aspects are balanced by benefits. Finally Horrobin argues that ancient mutations are what developed linguistic, creative and shamanic ability which in turn can potentially cause deficits in lipid metabolism or as it is termed in modern times Schizophrenia. While another scientist, Burns, follows that schizophrenia is related to modified cortical connectivity which is vital for the development of the 'social brain. One anthropologist putting forward this theory, Crow, states that schizophrenia is a result from incomplete hemispheric specialization due to selection of genes relating to language. These theories portray the disorder as a consequence of other, separate evolutionary changes. The first theory related to schizophrenia is Byproduct theories, which are a specific type of theory put forward by various scientists. There are several evolutionary theories related to schizophrenia spanning time from when Homo erectus gained control of fire onward to the modern day.
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5 Other studies using evolutionary explanations.4 Sexual Selection & Sex Differences in Schizophrenia.3 Schizophrenia as advantageous to individual, kin, and group.2 Schizophrenia as a byproduct of human evolution.Widely accepted views see schizophrenia as a disadvantageous byproduct of human evolution and schizophrenia as an evolutionarily beneficial. Evolutionary approaches have been used to try to explain the schizophrenia enigma. Under evolutionary pressures, certain phenotypes are favored, and this selection influences the frequency of genes that control these phenotypes. Why has such a debilitating disorder persisted for so long, with such frequency? This paradox has been referred to as the schizophrenia enigma, and many evolutionary models have been created to explain it.Įvolutionary approaches reflect on how human genes can change over time. Schizophrenia has raised a perplexing question for evolutionary psychologists and anthropologists. Schizophrenia has been hypothesized to be unique to human beings and existing for a long time. It has been found to present cross-culturally, and it almost always has 0.1% prevalence in a given population, although some studies have cast doubts on this. Compared to other psychological disorders like major depressive disorder (MDD) and generalized anxiety disorder (GAD), schizophrenia has significantly higher heritability.
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These experiences are evident in multiple sensory modalities and include deviation in all facets of thought, cognition, and emotion. Schizophrenia is a mental illness characterized by experiencing persistent hallucinations, delusions, paranoia, and thought disorder. ( Learn how and when to remove this template message) JSTOR ( May 2018) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Evolutionary approaches to schizophrenia" – news
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