If the brain were a country with at least two major entry ports, foreign currencies would be exchanged first for acceptability — at their market locations.

That currency becomes what anyone needs to have for engaging activities or actions, at parks, restaurants, schools, shops and so on.

There are many other things about the country with similarities, like language, flag, symbol and so on, but the currency probably holds the most powerful key for their free enterprise.

What are the major ports of the brain? And what currency do inputs become?

Sensory inputs arrive at two ports: the olfactory bulb — for smell and the thalamus — for all other senses.

It is from there they are relayed across the cortex for interpretation [or knowing, feeling and reaction].

Those relay centers are also known as sensory integration centers, which can be described as exchange points, from old currency to new.

In a free market economy, language, culture, law and all are crucial, just like molecules, impulses and so on are in the brain, but in that free market economy, it is impossible to live or survive without currency. Even if it is spent by someone else or the goods are donated, they are linked with currency.

What do senses become in the thalamus and in the olfactory bulb, to be useful in the brain? Thought or a form of thought as postulated. It is what gets spent across locations and destinations in the brain for activation.

Fear, for example, has to be when thoughts get somewhere, then fear is felt, similar to other experiences.

Alternatively, sitting on a phone causes fear because it becomes a sensory input, gets integrated into thought, goes to the memory to know what that means before proceeding to the destination for feelings, with reaction as adjusting and checking fast.

Thoughts and memory are two major parts of the mind that can determine how to understand ways to get better or to improve across conditions.

There are several kinds of iatrogenic conditions due to targets within the brain looking too specifically, not at the currency, or thoughts. This could become a major way for progress with computational psychopharmacology.