Here's a fragment of what I need to say, because I can't hold it in any longer.
Cognitive psychologists try to partition the mind into separate modalities, which are areas of the brain that deal with like cognitive processes. Modalities are set off from each other by how much interconnectivity there is in one area and how little connectivity there is between these different areas. The brain can be split into many different modalities, but combining these, there are only two: the verbal modality and the non-verbal modality. Verbal refers to language processing, and non-verbal refers to any processing that does not require spoken language (mostly visual elements).
It is in my belief that the functions rest on these two modalities. The verbal functions are T and F, the non-verbal functions are N and S. Any information processing in any of the functions takes place solely in one of these modalities.
To go even further, Kepinski, Gross, and the cognitive psychologists have shown that information metabolism is split into two parts: analysis and synthesis. The analysis process is the simple collecting of information; it takes in the whole and splits it into its parts. After that, the synthesis process creates associations between that information; it takes the parts and assembles them into the whole. This is also the process of understanding.
So J types accept information verbally and synthesize it non-verbally. P types accept information non-verbally and synthesize it verbally.
There is plenty more that can be derived from this, but for now, this post was only meant to be a fragment...
Your INTp friend,