Figure 1.

Timeline of Sensory Preconditioning training. During the Preconditioning phase, two neutral auditory cues (A1, A2) were presented serially and a third auditory cue (A3) was presented alone. The preconditioned (A1) and unpaired cue (A3) were either white noise (WN) or a tone (counterbalanced). During the Conditioning phase, a clicker stimulus (A2) was presented after A1 and paired with food reward. During the Test phase, A1 and A3 were presented in intermixed trials. Inset in third panel illustrated expected Test results in intact rats that successfully learned S-S association between preconditioned cue and click; that is, the preconditioned cue should elicit more post-CS responding than the unpaired cue.