Answer:
Subliminal perception
Explanation:
Subliminal perception can be defined as the process in which a person triggers someone mind to have a desire for a thing using sensory stimuli that are below such person
threshold for conscious perception and this often happen either through visual or auditory which enables the conscious mind of the person to register it in which it will be audible enough for the person subconscious mind. And in some cases the person may receive information from the senses that he /she is not consciously aware of.
Therefore Dr. Rafael’s experiment demonstrated SUBLIMINAL PERCEPTION