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Delusional Beliefs, Two-Factor Theories, and Bizarreness

Nie, Chenwei (2016) Delusional Beliefs, Two-Factor Theories, and Bizarreness. [Preprint]


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In order to explain delusional beliefs, one must first consider what factors should be included in a theory of delusion. Unlike a one-factor theory, a two-factor theory of delusion argues that not only anomalous experience (the first factor) but also an impairment of the belief-evaluation system (the second factor) is required. Recently, two-factor theorists have adopted various Bayesian approaches in order to give a more accurate description of delusion formation. By reviewing the progression from a one-factor theory to a two-factor theory, I argue that in light of the second factor’s requirements, different proposed impairments can be unified within a consistent belief-evaluation system. Under this interpretation of the second factor, I further argue that the role of a mechanism responsible for detecting bizarreness is wrongly neglected. I conclude that the second factor is a compound system which consists of differing functional parts, one of which functions to detect bizarreness in different stages of delusion; moreover, I hold that the impairment can be one or several of these functional parts.

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Item Type: Preprint
Nie, Chenwei
Subjects: Specific Sciences > Medicine > Psychiatry
Depositing User: Chenwei Nie
Date Deposited: 22 Jun 2023 13:38
Last Modified: 22 Jun 2023 13:38
Item ID: 22231
Official URL:
DOI or Unique Handle: 10.3868/s030-005-016-0020-1
Subjects: Specific Sciences > Medicine > Psychiatry
Date: 2016

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