A conditioned stimulus from one learning trial is used in place of an unconditioned stimulus in a new conditioning trial, where it is paired with a second stimulus. The second stimulus then comes to elicit the conditioned response, even though it has never been directly paired with the unconditioned stimulus. This is a description of a procedure called: a. latent learning training. b. higher order conditioning or second-order conditioning. c. stimulus generalization training. d. the extinction procedure.