According to classical conditioning, the previously neutral stimulus associated with an unconditioned stimulus will become a conditioned stimulus which will trigger a conditioned response after some time.
For example, at first salivation was produced by placing food on the dog's mouth but since the bell was used during the process of calling a dog for food , it's became a previously neutral stimulus . After a while the dog connects a bell with the food (unconditioned stimulus) as the bell becomes a conditioned stimulus it triggers the same response as does the unconditioned stimulus but since this response occurs due to a conditioned stimulus , it is a conditioned response.
The Hawthorne effect (also referred to as the observer effect) explains that individuals modify an aspect of their behavior in response to their knowledge of being observed. In this study students changed their eating place during the observation period.
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