Neural correlates of post-conventional moral reasoning: a voxel-based morphometry study

Area of Science:

• Neuroscience
• Psychology
• Cognitive Science

Background:

• Moral development research, following Kohlberg, posits stages of reasoning.
• Lower levels focus on self-interest or rules; post-conventional levels use deeper principles.
• The link between moral reasoning stages and brain structure is not well understood.

Purpose of the Study:

• To investigate if moral development stages correlate with structural differences in the brain.
• To explore the neural underpinnings of advanced moral reasoning.

Main Methods:

• Used voxel-based morphometry to analyze brain structure in 67 Master of Business Administration (MBA) students.
• Assessed moral development using the Defining Issues Test (DIT-2).

Main Results:

• Individuals at the post-conventional moral reasoning level showed increased gray matter volume.
• This increase was observed in the ventromedial prefrontal cortex and subgenual anterior cingulate cortex.
• These findings were compared to individuals at lower levels of moral reasoning.

Conclusions:

• Supports a role for cognitive and emotional processes in moral reasoning.
• Provides the first evidence linking brain structure to Kohlberg's stages of moral development.
• Suggests individual differences in brain structure align with moral reasoning stages.