The hallucinations experienced by individuals with schizophrenia serve as an example of an underlying dysfunction. This symptom is thought to be a sign of abnormalities in the brain's biological mechanisms, reflecting a flaw in the processes that should lead to healthy psychological functioning.

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The APA specifies that disturbed patterns of thoughts, feelings, and behaviors must reflect a flaw, or dysfunction, in the underlying mechanisms responsible for healthy psychological functioning. These mechanisms can be biological, psychological, or developmental in nature.

Underlying Dysfunction as an APA Criterion for Psychological Disorders

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

A person experiences debilitating, persistent fear of social situations, to the point where they avoid leaving their home. This has led to job loss and social isolation. According to the criteria for defining a psychological disorder, which of the following statements best represents the concept of an 'underlying dysfunction'?

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