In classical conditioning, the unconditioned stimulus (US) is
one that unconditionally, naturally, and automatically triggers
a response. For example, when you smell one of your favorite
foods, you may immediately feel very hungry. In this example,
the smell of the food is the unconditioned stimulus. Some more
examples of the unconditioned stimulus include: - A feather
tickling your nose causes you to sneeze. The feather tickling
your nose is the unconditioned stimulus. - Pollen from grass and
flowers causes you to sneeze. The pollen from the grass and
flowers is the unconditioned stimulus. In each of these
examples, the US naturally triggers an unconditioned response.
You don't have to learn to respond to the US. More Psychology
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