Mabel clicks her tongue while tickling Francis. Eventually, Francis starts to squirm and giggle every time Mabel clicks her tongue, even when he is not being tickled. In this example, tongue clicking is a(n) .

Conditioned stimulus

Explanation:

Conditioned stimulus, in terms of classical conditioning  is defined as the priory neutral stimulus that got triggered after coming in contact with unconditioned stimulus to generate conditioned response.

According to the question,tongue clicking is the conditioned response that was neutral but after getting associated with tickling it triggers a response of giggle in Mabel.Thus, Mabel learned the triggering effect produced by tongue clicking.

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