The process of receiving and representing stimulus energies by the nervous system is called

It is called a sensation.

Explanation:

Sensation is known as a sensorial process. It passes through 3 phases:

Physical phase: the stimulus activates the sensorial organ, such as hearing a song would activate the ear receptors. Physiological phase: the information is processed and transformed into neural information, thus activating structures in the nervous system. Psychological phase: the brain gets a perception of what the sensation is and what it represents.