Which theory would suggest that watching a horror movie late at night could lower your absolute threshold for sound as you subsequently tried to fall asleep?

signal detection theory.

Explanation:

Signal detection theory, which at its most basic, states that the detection of a stimulus depends on both the intensity of the stimulus and the physical/psychological state of the individual. Basically, we notice things based on how strong they are and on how much we're paying attention.

For example, A hit is when the signal is present and detected. A miss is when the signal is present and not detected. A false alarm is when the signal is absent but is detected, like hearing your phone ring when no one is calling or a knock at the door when no one is there.

i believe it is true.        

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