your brain is divided into 3 main parts

[granpa]

your brain is divided into 3 main parts each of which is an autonomous brain unto itself:

Forebrain (CEO)
Midbrain (input)
Cerebellum (output)
​

the cerebral cortex (forebrain) is CEO & is concerned with 'what' to do. The forebrain is the source of imagination

You are the forebrain. The midbrain and cerebellum are your helpers that take care of routine tasks so you can concentrate on more important things. Most information goes straight from input to output bypassing the forebrain.
​

the midbrain is input & is concerned with 'why' we do what we do

The midbrain has thousands of eyes and can raise the alarm when something needs attention These alarms exert an irresistible all-powerful force upon you. Fortunately for us the midbrain only wants what is best for us and never asks anything for itself. These alarms are capable of giving us infinite energy. The midbrain is the "sun" that lights up our mind.
​

the cerebellum (hindbrain) is output & is concerned with 'how' to do what we do

The cerebellum has thousands of hands and can juggle thousands of things at once but doesn't know "what" it is doing. The cerebellum takes care of simple procedures so the forebrain can concentrate on more important issues. It also helps the midbrain accomplish its tasks. You point at the target and the cerebellum shoots. (But sometimes it "misses")
​

Each of these 3 parts is likewise divided into an input, output, and CEO each of which is likewise divided into an input, output, and CEO. This continues right down to the level of neurons.
As a result your brain is a city full of independent units, organized into a fractal pyramid, that are constantly talking back and forth, buying and selling, living and dying (See HOW THE MIND WORKS by Steven Pinker).

each triangle is a brain unto itself



of course we can't communicate with these independent modules in a human brain but in the future when we have smart enough robots it will be possible to communicate with the independent modules in the computers brain.
some of these independent modules may be removed and made into independent robots

 

[granpa]

actually the mid brain is only the "Sun of the mind" until we fall
at which point the cerebellum takes over its job and botches it completely.

 

[granpa]

the four dichotomis of the Myers Briggs personality types correspond to 4 of the main divisions of the brain

 

[BL2KTN]

This is far, far, far too simplified. The brain is indeed divided into three major parts, but not in the way you describe. The neocortex is the most significant part in regards to mammalian cognition, and it is where we find over one-hundred million pattern recognizers. These pattern recognizers don't function as a pyramid, however, as they are far too scattered for that sort of system - instead you have pattern recognizers set up in hierarchies. One set of neurons in your brain is constantly looking for diagonal lines, another for crossbars. When both light up, the pattern recognizer for the letter "A" flashes, and then that is fed up to the next hierarchy that deals with word recognition. Two-hundred levels up you have recognizers that are noting the poem you are reading is "beautiful" or "sad".

That's the system as we understand it best today using neuropsychology.