presented below the threshold of a person's conscious awareness
Subliminal stimulus is sensory stimulation at the threshold of a person's conscious sensory perception. Thus, such stimulus cannot be consciously heard or seen. An example would be quickly flashing an image so that a person is not able to consciously process the image and is thus unaware of having seen it.
Despite bypassing a person's conscious awareness, subliminal stimuli have been shown to still activate certain parts of the brain.
