So I couldn't find a thread about Dario Nardi and his amazing book, Neuroscience of Personality, so here one is.
To make the book he scanned the brains of more than 60 university students using an EEG, each subject for 3-4 hours. He asked them a range of questions, did various physical activities like catching a ball, made them recall experiences, do something they were good at, all kinds of stuff. He found tons of evidence for type, measured neuroscientific information that displays the physical reality of type and function.
He found that the cognitive functions talked about in MBTI circles are present in the brain as distinct patterns of activity, giving people a natural inclination towards certain skills and behaviors. In the presentation he gives to Google (on youtube, over an hour long, very good) he mentions that the brain activities of 2 random people are roughly 5% similar but 2 people of the same myers briggs type have roughly 80% similarity.
Your functions are almost like incredible brain superpowers, appearing as amazing different patterns on the EEG display. As well as function states the brains of the 16 types use different sets of preferred individual regions.
Here's some of what he had to say about the 16 different types, their functions and some of their favorite regions.
Introverted Intuition- INTJ - INFJ
Ni appears as a whole brained state, where all the areas attached to the EEG are in a synchronized at low power that can last for up to 10 minutes appearing as a solid blue on the EEG.
All types display the blue state in certain situations, which is known as flow. If someone has mastered a skill over many years, such as dancing, then when they perform that skill their brain will show this state.
Ni types can achieve flow from being asked a single question, and display it when tackling completely unfamiliar problems. They also use it when planning into the future. Ni is basically an upside down flow state. ENTJs and ENFJs also use this state somewhat, they usually benefit from kind of sensory focus to get into it and hard metaphysical questions can bring it about. In terms of individual regions All 4 of these types use the precise speaking region of the brain very heavily. INTJs and INFJs are strongly visual in their thinking, ENTJs and ENFJs have POWER CIRCUITS of 4 key regions which they use for thinking efficiently and HYPER FAST, DAMN.
Extraverted Intuition - ENTP - ENFP
A fast, high energy consuming, asynchronous whole brained state, the "christmas tree" brain. Trans-contextual and creative, tapping all areas of the brain at different and shifting levels of power.
For the rest of us words like cat and dog evoke a simple response from a visual, auditory or memory region, but the Ne dominant will employ all regions suddenly and expand the words into many possiblerelationships and situations. Two brothers, one happy and fun like a dog, the other quiet and serious like a cat...if dogs and cats could write then how would the styles differ?
ENTPs are precise speaking strategic gamers, weighing multiple pros and cons. ENFPs are imaginative mimics and listeners. As well as using this state to some degree INFPs can enter the blue state when listening to someone, which they do fully and for extended periods. INTPs can also achieve a green whole state to shut out emotion for objective reasoning in certain situations.
More functions in the next post