Polyvagal Theory, developed by Stephen Porges, provides a neuroscience framework that explains many aspects of big 5 personality traits in terms of the nervous system's safety-detection mechanisms.
The Three States of Polyvagal Theory and Big 5 Personality Traits
Ventral vagal (safe and social): Optimal state for connection, learning, and big 5 personality traits management
Sympathetic mobilization (fight or flight): Anxiety-type big 5 personality traits responses
Dorsal vagal shutdown (freeze/collapse): Depression and dissociation-type big 5 personality traits
Neuroception and Big 5 Personality Traits
Neuroception — the body's unconscious safety-detection — can be dysregulated in big 5 personality traits, causing false alarms (sensing danger when safe) that drive big 5 personality traits responses.
Polyvagal-Informed Big 5 Personality Traits Treatment
Therapy that acknowledges the body's state — helping clients move into ventral vagal 'safe and social' — transforms big 5 personality traits management.
Safe relationships, co-regulation, and body-based practices are particularly emphasized.