your personality type determined by nurture or nature explained forever so you won’t need any other.

sometimes it’s determined by nurture mostly and sometimes totally nature.

if you born as a very introverted baby, nurture have to be really intensely in the other direction to turn you into an extravert and that’s still in theory. you will probably stay an introvert.

but not all babies born very “introverted” or very “extraverted”. in fact, most babies will born with normal values so for these babies nurture going to play a very important role.

okay but how and why babies born as an introvert? or as a feeler? hormones and neurotransmitters can explain a ton.

for example a high dopamine baby will be more energetic, then they will explore more and cry harder and be restless. naturally, for this baby to become an extravert will be much more likely.

then, if a baby has more testosterone than usual this will further make them more direct, brave and masculine-like what else to expect?

but if a baby has low testo as a boy or high estrogen as a girl, then chances of these to become feelers gonna increase too.

see, i just talk about two hormones and so many stuff explained already. there are many other hormones:

and neurotransmitters:

• low noradrenaline maybe contributes to xxxp personality type development and high noreadrenaline to xxxj?
• high serotonin / gaba maybe increase the chances of high si and makes you chill?
• read this about acetylcholine / dopamine. which is all about introversion vs extraversion.
• and the things endorphins does can be read as a very stereotypical se definition.

so yeah, once again: the more normalized your values on these, the more nurture will affect you, the more open are you as a system to change. the more anomalies there are the more nature will determine things.