Question

An unconditioned stimulus

naturally occurs in response to an object.

automatically triggers an unconditioned response.

eventually occurs as a result of learning new behaviors.

periodically appears when an experimenter presents an object.

Answer 1

An unconditioned stimulus is something in the environment that naturally causes us to react, in some kind of way.

For example, if a balloon were to pop right in your face,
you would probably blink, and flinch.

This is a natural reaction.
And natural reactions are called "unconditioned responses."

The popping balloon is an "unconditioned stimulus."
It naturally causes us to flinch, out of surprise and fear.

Answer 2

thank you!