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The relationship between schizoid personality disorder (SzPD) and avoidant personality disorder (AvPD) has been a subject of controversy for decades. [1] [2]Today it is still unclear and remains to be seen if these two personality disorders are genuinely distinct, but overlapping, personality disorders, or if they are merely two different phenotypic expressions of the same underlying disorder.
Schizoid personality disorder (/ ˈ s k ɪ t s ɔɪ d, ˈ s k ɪ d z ɔɪ d, ˈ s k ɪ z ɔɪ d /, often abbreviated as SzPD or ScPD) is a personality disorder characterized by a lack of interest in social relationships, [9] a tendency toward a solitary or sheltered lifestyle, secretiveness, emotional coldness, detachment, and apathy. [10]
The question of how schizophrenia could be primarily genetically influenced, given that people with schizophrenia have lower fertility rates, is a paradox. It is expected that genetic variants that increase the risk of schizophrenia would be selected against, due to their negative effects on reproductive fitness .
However, schizophrenia itself is regarded as a breakdown process, quite distinct from the continuously distributed trait of schizotypy, and forming a second, graded continuum, ranging from schizotypal personality disorder to full-blown schizophrenic psychosis.
Schizothymia is a temperament related to schizophrenia in a way analogous to cyclothymia's relationship with bipolar disorder. [1] Schizothymia was proposed by Ernst Kretschmer when examining body types of schizophrenic patients.
Schizotypal personality disorder (StPD or SPD), also known as schizotypal disorder, is a cluster A personality disorder. [4] [5] The Diagnostic and Statistical Manual of Mental Disorders (DSM) describes the disorder specifically as a personality disorder characterized by thought disorder, paranoia, a characteristic form of social anxiety, derealization, transient psychosis, and unconventional ...
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Schizophrenia is a primary psychotic disorder, whereas, bipolar disorder is a primary mood disorder which can also involve psychosis. Both schizophrenia and bipolar disorder are characterized as critical psychiatric disorders in the Diagnostic and Statistical Manual of Mental Disorders fifth edition (DSM-5). [ 1 ]