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5 Cards in this Set

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Variable-ratio (VR) schedule
A reinforcement schedule in which the reinforcer is given after a variable number of nonreinforced responses.
Unconditioned stimulus (UCS)
A stimulus that evokes an unconditioned response without previous conditioning.
Variable-interval (VI) schedule
A reinforcement schedule in which the reinforcer is given for the first response after a variable time interval has elapsed.
Unconditioned response (UCR)
An unlearned reaction to an unconditioned stimulus that occurs without previous conditioning.
Trial
In classical conditioning, any presentation of a stimulus or pair of stimuli.