Intuitions about personal identity are rooted in essentialist thinking across development

Area of Science:

• Cognitive Psychology
• Philosophy of Mind
• Developmental Psychology

Background:

• Personal identity research traditionally focuses on psychological continuity (e.g., memory, beliefs).
• However, lay beliefs often emphasize physical continuity as crucial for identity.
• The psychological underpinnings of this reliance on physical composition remain underexplored.

Purpose of the Study:

• To investigate the cognitive origins of the belief in physical continuity as a criterion for personal identity.
• To test the hypothesis that psychological essentialism drives the emphasis on physical composition.

Main Methods:

• Four studies were conducted, employing experimental manipulations and correlational designs.
• Participants were exposed to essentialist reasoning or their individual differences in essentialist thinking were assessed.
• Measures included endorsement of physical continuity and reliance on physical composition for identity judgments.

Main Results:

• Exposure to essentialist reasoning increased the endorsement of physical continuity for personal identity.
• Individual differences in essentialist thinking correlated with greater reliance on physical continuity.
• This effect was observed across adult participants and children aged 6–9 years.

Conclusions:

• Psychological essentialism provides a cognitive basis for the intuitive importance of physical composition in personal identity.
• These findings highlight a previously unidentified factor influencing judgments of personal identity over time.
• The research advances our understanding of the psychology of personal identity by linking it to broader essentialist tendencies.