Book contents
- Evolutionary Psychiatry
- Reviews
- Evolutionary Psychiatry
- Copyright page
- Contents
- Contributors
- Foreword
- Preface
- Chapter 1 Introduction to Evolutionary Psychiatry
- Chapter 2 The Biopsychosocial Model Advanced by Evolutionary Theory
- Chapter 3 Hominin Evolution I
- Chapter 4 Hominin Evolution II
- Chapter 5 Hunter-Gatherers, Mismatch and Mental Disorder
- Chapter 6 Why Do Mental Disorders Persist?
- Chapter 7 Anxiety Disorders in Evolutionary Perspective
- Chapter 8 Evolutionary Perspectives on Depression
- Chapter 9 On the Randomness of Suicide
- Chapter 10 Evolutionary Perspectives on Schizophrenia Spectrum Disorders
- Chapter 11 Evolutionary Perspectives on Eating Disorders
- Chapter 12 Substance Abuse and Evolution
- Chapter 13 The Social Function of Alcohol from an Evolutionary Perspective
- Chapter 14 Evolutionary Perspectives on Childhood Trauma
- Chapter 15 Evolutionary Perspectives on Neurodevelopmental Disorders
- Chapter 16 Maternal Negativity and Child Maltreatment
- Chapter 17 Alzheimer’s Disease as a Disease of Evolutionary Mismatch, with a Focus on Reproductive Life History
- Chapter 18 Psychopharmacology and Evolution
- Chapter 19 What the Evolutionary and Cognitive Sciences Offer the Sciences of Crime and Justice
- Chapter 20 Evolutionary Thinking and Clinical Care of Psychiatric Patients
- Index
- References
Chapter 6 - Why Do Mental Disorders Persist?
Evolutionary Foundations for Psychiatry
Published online by Cambridge University Press: 08 September 2022
- Evolutionary Psychiatry
- Reviews
- Evolutionary Psychiatry
- Copyright page
- Contents
- Contributors
- Foreword
- Preface
- Chapter 1 Introduction to Evolutionary Psychiatry
- Chapter 2 The Biopsychosocial Model Advanced by Evolutionary Theory
- Chapter 3 Hominin Evolution I
- Chapter 4 Hominin Evolution II
- Chapter 5 Hunter-Gatherers, Mismatch and Mental Disorder
- Chapter 6 Why Do Mental Disorders Persist?
- Chapter 7 Anxiety Disorders in Evolutionary Perspective
- Chapter 8 Evolutionary Perspectives on Depression
- Chapter 9 On the Randomness of Suicide
- Chapter 10 Evolutionary Perspectives on Schizophrenia Spectrum Disorders
- Chapter 11 Evolutionary Perspectives on Eating Disorders
- Chapter 12 Substance Abuse and Evolution
- Chapter 13 The Social Function of Alcohol from an Evolutionary Perspective
- Chapter 14 Evolutionary Perspectives on Childhood Trauma
- Chapter 15 Evolutionary Perspectives on Neurodevelopmental Disorders
- Chapter 16 Maternal Negativity and Child Maltreatment
- Chapter 17 Alzheimer’s Disease as a Disease of Evolutionary Mismatch, with a Focus on Reproductive Life History
- Chapter 18 Psychopharmacology and Evolution
- Chapter 19 What the Evolutionary and Cognitive Sciences Offer the Sciences of Crime and Justice
- Chapter 20 Evolutionary Thinking and Clinical Care of Psychiatric Patients
- Index
- References
Summary
Discovering why natural selection has left humans vulnerable to mental disorders will make psychiatry more sensible and effective, but defining the appropriate objects and kinds of explanation remains challenging. Asking how a disorder increases fitness is a mistake; disorders are not adaptations and they do not have evolutionary explanations. The correct objects of explanation are the traits that make all members of a species vulnerable to a disorder. Task 1 is to describe the evolutionary origins and functions of the traits involved. Task 2 is to describe the proximate processes that result in the disorder. Task 3 is to discover why natural selection left the traits vulnerable to malfunction. Five main kinds of explanation need to be considered: stochasticity, path dependence, mismatch, trade-offs that benefit the individual and traits that benefit gene transmission at a cost to the individual. Depression, addiction, eating disorders, autism and schizophrenia are used to illustrate the opportunities and challenges of framing and testing hypotheses about vulnerability. Multiple explanations are often needed for a single disorder, frustrating the wish for simplicity. However, recognising the fundamental differences between organic and designed systems offers opportunities for resolving – or at least understanding – some enduring controversies in psychiatry.
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- Evolutionary PsychiatryCurrent Perspectives on Evolution and Mental Health, pp. 84 - 100Publisher: Cambridge University PressPrint publication year: 2022
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