For classical conditioning to be effective, the conditioned stimulus must be

_____ believed that classical conditioning occurred because the conditioned stimulus became a substitute for the unconditioned stimulus when paired closely together in time.

An unlearned, involuntary response, such as salivating when presented with food, is

A stimulus that has no effect on the desired response is a(n) _____ stimulus.

When a previously neutral stimulus, through repeated pairing with the unconditioned stimulus, begins to cause the same kind of reflexive response, the neutral stimulus has become

When Pavlov stopped giving the dogs food after the real conditioned stimulus, they stopped salivating to the sound of the ticking. This is called

Without the _____, higher-order conditioning would be difficult to maintain and would gradually fade away.

A naturally occurring stimulus that leads to an involuntary (reflex) response is a(n)

In his classical conditioning experiment, Pavlov's dogs were conditioned to salivate when they