There seems to be some interesting informal link between the fields of usability and neuroscience. Donald Norman (of the Nielsen Norman Group) got his start in neuroscience (psychoacoustics as far as I recall), and Jeff Hawkins - inventor of the palmpilot, and through that one of the real world usability heroes has founded The Redwood Neuroscience Institute - an institution involved in mathematical modeling of cognition.
Obviously there's a mutual interest in behaviour between the two fields - but I find it interesting that this interest in behaviour is as concrete as it appears to be. It is as if the construction of usable objects functions as a concrete test for cognitive theories.