The One to Many Problem and the Many to One Problem

The one to many problem is of course under determination in another set of words. One psychological process can be explained by a very large number of physiological mechanisms if you don't have any other constraints. That means that many different parts of the brain, many different brain arrangements, machinery, interactions may produce the same kind of behavior. This is also part of the under-determination problem. Also we're learning now that there are not areas in the brain like face perception areas or house perception areas. What there are are different configurations which are not amenable to a study with inadequate number of microelectrodes or a MRI.