The polyvagal theory: new insights into adaptive reactions of the autonomic nervous system.
Level 5 - mechanism / opinion, no new human data
Mechanism-based reasoning and theoretical review with no new empirical human data
PubMed 19376991 · doi:10.3949/ccjm.76.s2.17
What was done
This narrative review outlines the polyvagal theory, focusing on phylogenetic transitions in the vertebrate autonomic nervous system and adaptive neural reactivity.
What was found
The abstract reports no empirical data or quantitative findings. It describes a theoretical framework proposing that the phylogenetic transition from reptiles to mammals shifted cardiac vagal efferent pathways from the dorsal motor nucleus of the vagus to the nucleus ambiguus, creating a face-heart connection tied to a social engagement system.
Why it matters
The paper presents a widely cited conceptual model that links evolutionary neuroanatomy of the autonomic nervous system with behavioral and social regulation.
Limits
The abstract describes a purely theoretical narrative review containing no original empirical data, sample size, or systematic methodology.
Cited by
- context The mammalian vagus nerve is neuroanatomically linked to the cranial nerves controlling facial expression and vocal intonation.