text: quantities as its target: the variational free energy (VFE) in the case of perception and the 
  expected free energy (EFE) in the case of action. The VFE is the free energy associated with 
  a given sensory observation and is resolved perceptually by updating beliefs about the 
  environment. The EFE is the free energy that is expected in the future, contingent on a 
  given policy or course of action. Choosing action policies associated with a low EFE lead 
  to reducing uncertainty about the environment, as well as making preferred observations 
  more likely. 