Figure 2.

(A) Conditioned response (CR) amplitude in 102 4- and 26-mo-old rabbits that received 90 paired presentations of tone conditioned stimulus and corneal airpuff unconditioned stimulus for 10 training sessions in the 600- or 750-msec delay or trace eyeblink classical conditioning paradigms. (B) CR amplitude data presented in A averaged over 10 sessions and compared with analysis of the significant effects. The difference in CR amplitude between the delay and trace paradigms was significant beyond the 0.001 (***) level of confidence. Error bars, SEM.