Some psychologists believe that there are two systems in the human brain, namely system 1 and system 2. The operation of System 1 is unconscious and fast, not very laborious, and is completely in a state of autonomous control. System 2 shifts its attention to brain activities that require mental effort, such as complex calculations. The operation of system 2 is usually associated with subjective experiences such as behavior, choice and concentration.
According to the above definition, which of the followings is the behavior caused by the operation of system 2?
Determine the source of sudden sound.