Is a stimulus is an external physical event that occurs only after the behavior?
I believe that this question is asking whether or not the statement provided is true. If that is the case, then the statement is false. Generally speaking, a stimulus precedes a behavior.
In biology, a stimulus is more often than not some kind of environmental factor that causes a response. Some responses are not under conscious control. When the doctor tests the reflex in the knee, he/she provides a stimulus by tapping just below the kneecap. That stimulus generates a response, and the leg kicks forward....
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