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Related Experiment Video

Updated: Jun 8, 2025

A New Method for Inducing a Depression-Like Behavior in Rats
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Mental disorders may prevent, not cause, suicide.

Annie Swanepoel1, C A Soper2

  • 1North East London NHS Foundation Trust, UK.

Bjpsych Bulletin
|November 5, 2024
PubMed
Summary

This study challenges the idea that depression causes suicide. Instead, it suggests that some depression symptoms may actually prevent lethal self-injury, acting as evolved psychological defenses.

Area of Science:

  • Evolutionary Psychology
  • Psychiatry
  • Clinical Psychology

Background:

  • A common belief is that depression directly causes suicide.
  • This perspective overlooks potential protective mechanisms.
  • Evolutionary pressures may have shaped defenses against lethal self-injury.

Purpose of the Study:

  • To challenge the causal link between depression and suicide.
  • To propose that certain psychopathological symptoms may prevent lethal self-injury.
  • To explore the evolutionary basis of suicide prevention mechanisms.

Main Methods:

  • Theoretical review of evolutionary pressures on suicide.
  • Examination of empirical evidence linking psychopathology to self-injury prevention.
  • Analysis of psychological defense mechanisms against lethal self-injury.
Keywords:
Suicideaddictiondepressionevolutionself-harm

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Main Results:

  • Evidence suggests some depression and psychopathology symptoms may prevent suicide.
  • Evolved psychological defenses against suicide are proposed.
  • These defenses may manifest as diverse psychiatric phenomena.

Conclusions:

  • The theory that certain symptoms prevent suicide is supported by evidence.
  • Implications for understanding and treating suicide and psychopathology are significant.
  • Further research can test this evolutionary model of suicide prevention.