Question

Bjorn's alarm clock makes a faint clicking noise a second before the alarm goes off. At first, the clicking noise doesn't wake Bjorn, but the alarm does. After a couple weeks, he awakens as soon as he hears the clicking noise. The clicking noise is a(n)

Answer 1

Answer:

unconditioned stimulus

Explanation:

Unconditioned stimulus -

It is the type of stimulus which automatically , unconditionally triggers any response , is referred to as unconditioned stimulus .  

The example of an unconditioned stimulus , is the smell of very delicious food , automatically makes a person hungry.  

Hence, from the question , as the alarm clock act as a unconditioned stimulus.