Ralph ate sushi for lunch, and an hour later he felt sick to his stomach. In this situation, classical conditioning might occur. In other words, Ralph might learn an association between sushi and feeling sick because the two events

are paired closely in timing.

Explanation: The time between the consumption of sushi and Ralph's sick feeling could spark or trigger an association between a conditioned or potent stimulus, which is the sushi Ralph consumed for lunch and an unconditioned stimulus, which in this case is the sick feeling felt by Ralph in his stomach. This association between a conditioned stimulus and a previously unconditioned stimulus, leading to a conditioned response is called classical conditioning. The association or pairing between both stimulus is the timing of the occurrence of both stimulus.

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