A theoretical and empirical comparison of the all-or-none multilevel theory and the mixed model

Two theories for stimulus generalization in paired-associate learning (P.A.L.) are compared—the mixed model and the all-or-none multilevel theory. Both theories postulate basic all-or-none learning processes but differ in their mechanism for generalization. The mixed model postulates that generalization occurs only during responding; whereas, the multilevel theory postulates that generalization takes place during learning itself.