@Fil Albuquerque,
You're always talking about the physical brain while humans react to the external environment. When the environment changes, the options change. You can't get around this simple fact. The environment for all humans change from minute to minute, hour to hour, day to day, year to year...so forth, and so on.
It's the same brain, except it has been exposed to more experiences and perceptions - that are all subjective to the individual. That's how humans select future choices from the "increased" knowledge.
It boils down to genes and environment, not how the physical brain operates. Simply put, it's the chemicals in the brain that sends messages of our unique subjective choices based on our own experiences and perceptions.