p1 - topic 6: polyvagal theory Flashcards
dorsal vagus
ancient system that controls rest and digest
williams syndrome
safety when there’s none
criticisms for polyvagal theory
edwin taylor: claims there’s no scientific evidence for distinct functions of myelinated and nonmyelinated vagus, no 100% anatomical match
pvt says one system is more primitive than the other, but no evidence
danger to life
defense (immobilisation), freeze
nonmyelinated vagus of parasympathetic ns
sinus node
frequency defines heart rate
what can make behaviour maladaptive in the polyvagal theory?
- problems with neuroception (interpreting situations as life threatening even when they’re not)
- disturbed development of functional subsystems
- inflexible functioning of vagal brake
biphasic emotional reaction
going from hyper to hypoarousal –> problem when optimal zone is narrow
vegetative functions of safety neuroception
- visceromotor component: cardiac regulation (vagal brake)
- somatomotor component: head, face and chewing muscles, esophagus middle ear
neuroception through the nervous system
safety
danger
danger to life
two tracks the vagus nerve runs on
dorsal vagus
ventral vagus
danger
defense (mobilisation), fight / flight response
sympathetic ns
emotional tolerance window
hyperarousal zone: fight/flight -> sympathetic activation
optimal arousal zone: ventrovagal social reaction
hypoarousal zone: dorso vagal immobilisation reaction
safety - spontaneous connection with others
eye contact, facial expressions, support visceral homeostasis
myelinated vagus of parasympathetic ns
ventral vagus
newest evolutionary function, myelinated axons that start from the nucleus ambiguous
allows us to use our social capacities
