"When Antonio rode the Ferris wheel at the amusement park for the first time, he became very dizzy..." In this case the unconditioned stimulus is a Ferris wheel ride. This is further explained below.
Generally, Giant vertically rotating wheel with passenger vehicles dangling from its outside edge at the fairgrounds.
In conclusion, "Antonio got dizzy the first time he rode the Ferris wheel at the amusement park..." A trip on the Ferris wheel serves as the unconditioned stimulus in this scenario.
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