4. An Illusion is a distortion
of the senses, how the
brain normally organizes
and interprets sensory
stimulation.
In short, a false idea or
belief or a deceptive
appearance.
11. Optical Illusion
An optical illusion is characterized by
visually perceived images that differ
from objective reality.
12. Auditory Illusion
An auditory illusion is an illusion of
hearing. In this, the listener hears either
sounds which are not present in the
stimulus or impossible sounds.