Grace whistles while tickling Khaleel with a feather. Eventually, Khaleel starts to squirm and giggle every time Grace whistles, even when he is not being tickled. In this example, squirming and giggling is a(n) ________.
conditioned response
conditioned stimulus
unconditioned response
unconditioned stimulus
conditioned stimulus is a previously neutral stimulus that, after becoming associated with the unconditioned stimulus, eventually comes to trigger a conditioned response