Figure 2.

Rabbits can learn trace–eyeblink conditioning with vibrissa stimulation as the conditioned stimulus. A, Typical eyeblink response during conditioning on day 1 and day 7. The upward deflection represents a sweep of the nictitating membrane across the cornea. Note the CR during the trace interval on day 7 as an indication of learning. B, The percentage of number of conditioned responses across training days for trace- and pseudo-conditioned rabbits. Only one conditioned rabbit required 9 d to reach criterion (80% CRs); hence, there are no error bars for these last two data points. Error bars represent SEM.