enneagram email message today. I am such a 5.
I'm a type 5 enneagram also, and have found that it the most useful of all the personality typing methods that I've explored.
I'm still considering throwing in enneagram models into the structural dissociation thread adding it with Panksepp's work, but it's a bit challenging to create a simplified summary.
On the surface, I like their breakdown of types 8,9,1 as instinctual body types, 2,3,4 as emotional heart types, and 5,6,7 as head thinking types...
Rough connection would be that
body types might be using the RAGE, SEEKING and reptile brain type circuits,
heart types are more fixated with the PANIC/GRIEF relational mammalian limbic brain circuits, and
head types are more intellectual anxiety based (FEAR circuits + cognitions)..
It also might work by identification with perspectives, body types are more 1st person (me)
doing/action behavioral perspective (single focus action identified), heart types are more 3rd person vs 1 person (we+she/he+me)
feeling/relating and comparing perspective (outer world/relating), and head types are more 3rd person (he/she/it)
watching/observing/thinking perspective (inner world/imagination).