Subtype Collection: SeTi-Ni

The flat affect is quite present, too. Here is a collage of Eminem:



There's a combination of the flat affect + Ekman signals of anger.
A level of antagonism seems to also be part of the SeTi trajectory of unhealthiness.


Right. It seems to be the case that introverts are more prone to manifest depression and extroverts to manifest mania, as a neurotic vector of that innate energy. But when you have crossover, like an SeTi-Ti or SeTi-Ni then you do get a mixing of traits. In enneagram terms they may be type 7 yet also a 4, and alternate between those strategies in a bipolar sort of way.

This is still a tentative idea for me though.
But in general, introverted subtypes = 4/5/1/9 , extroverted subtypes = 3/8/7/6
(using enneagram only as a descriptive system, not definitive one)