• Orectic psychological determinism is the view that we must always act upon our greatest drive. This is often called psychological hedonism
  Psychological hedonism
  Psychological hedonism is the theory that all human choice is motivated by a desire for pleasure .This theory of human motivation cannot rule out altruism without being contradicted by evidence. Rather, it claims that when sane people choose to help others, it is because of the pleasure they...
  
  , and if the drive is specified for self-interest: psychological egoism
  Psychological egoism
  Psychological egoism is the view that humans are always motivated by self-interest, even in what seem to be acts of altruism. It claims that, when people choose to help others, they do so ultimately because of the personal benefits that they themselves expect to obtain, directly or indirectly,...
  
  .
• Rational psychological determinism claims that we must always act according to our "strongest" or "best" reason.

External links

• http://www.utilitarianism.com/psychohed.htm