According to the classical conditioning theory, people develop a phobia
of spiders, for example, because they have experienced an aversive conditioning
event (UCS) in the context of spiders. Advocates of the classical
conditioning theory have failed to define this learning processin a
non-equivocal way. At times they have portrayed classical conditioning
as a cognitive type of learnmg. Yet, at other times they have underlined
the unconscious nature of classical conditioning. Although retrospective
studies suggest that phobic patients often recall conditioning events,
non-phobic control subjects also report such conditioning events. Davey's. UCS-reevaluation theory appears to circumvent the problem of
cognitive vs non-cognitive learning. Moreover, it allows that both phobic
and non-phobic persons have conditioning experiences. Thus far, the
empirical basis of UCS-reevaluation is meagre.