Table 3.

Model	Latent inhibition	Protection by a neutral stimulus	Enhanced Protection by an inhibitor	Attenuated protection by extinction of the inhibitor's excitor
Pearce-Hall	Yes	No	Yes	No
Conditioned Attention Theory	Yes	Yes	No	No
Rescorla-Wagner and Revised Rescorla-Wagner	No	No	Yes	No
SOP and Modified SOP	Yes	Yes	No	No
Extended Comparator Hypothesis	Yes	Yes	Yes	Yes

Summary of the phenomena observed in Experiments 1 and 2 accounted for by various models. Only the extended comparator hypothesis is capable of explaining all of the effects. See text for details.