US>CS>R and CD>R represent two different classical conditioning processes.
In US>CS>R, the unconditioned stimulus (US) is paired with a neutral stimulus, which becomes the conditioned stimulus (CS). Eventually, the CS elicits the conditioned response (R) that was originally only elicited by the US. For example, if a bell is repeatedly paired with the presentation of food, eventually the sound of the bell alone (CS) will elicit the salivation response (R) that was originally only elicited by the sight of the food (US).
In CD>R, the conditioned stimulus (CS) is paired with another stimulus, which becomes a conditioned inhibitor (CD). The CD inhibits the conditioned response (R) that was originally elicited by the CS alone. For example, if a tone (CS) is paired with a shock that consistently follows the tone, the organism will eventually learn to fear the tone and show a fear response (R). However, if the tone is then presented with a light that signals "safety" and is never followed by a shock, the light (CD) will inhibit the fear response (R) typically elicited by the tone (CS) alone.
Exaplin the diagram US>CS>R
CD>R in terms of classical conditioning
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