illusions in the Dictionaries and Encyclopedias
optical illusion (also called a visual illusion) is an illusion
caused by the visual system and characterized by visually perceived
images that differ from objective reality. The information gathered
by the eye is processed in the brain to give a percept that
does not tally with a physical measurement of the stimulus source.
There are three main types: literal optical illusions that create
images that are different from the objects that make them, physiological
illusions that are the effects of excessive stimulation of a
specific type (brightness, colour, size, position, tilt, movement),
and cognitive illusions, the result of unconscious inferences.
Pathological visual illusions arise from a pathological exaggeration
in physiological visual perception mechanisms causing the aforementioned
types of illusions.
Optical illusions are often classified into categories including
the physical and the cognitive or perceptual, and contrasted
with optical hallucinations.
Wikipedia, the free encyclopedia
is an Optical Illusion? Optical Illusions can use color,
light and patterns to create images that can be deceptive or
misleading to our brains. The information gathered by the eye
is processed by the brain, creating a perception that in reality,
does not match the true image. Perception refers to the interpretation
of what we take in through our eyes. Optical illusions occur
because our brain is trying to interpret what we see and make
sense of the world around us. Optical illusions simply trick
our brains into seeing things which may or may not be real.
Try out some of these illusions and discover just how tricky
it can be for your brain to accurately interpret the images
from your eyes.
of OPTICAL ILLUSION
Something that looks different from what it is : something that
you seem to see but that is not really there.
The closer building looks larger than the farther one, but it's
just an optical illusion. The two buildings are actually the
of optical illusion in English:: optical illusion
Something that deceives the eye by appearing to be
other than it is. An experience of seeming to see something
which does not exist or is other than it appears.
are distortions of a sensory perception, revealing how the
brain normally organizes and interprets sensory stimulation.
Illusions can occur with each of the human senses, but visual
illusions are the most well known and understood. The emphasis
on visual illusions occurs because vision often dominates
the other senses. Some illusions occur because of biological
sensory structures within the human body or conditions outside
of the body within one’s physical environment. Other
illusions are based on general assumptions the brain makes
during perception. These assumptions are made using organizational
principles, such as an individual's depth perception and motion
perception, and perceptual constancy that are part of our
Most illusions occur in people of all cultures and environmental
experiences, indicating that they reflect universals in human
perception. Research in illusions therefore seeks to understand
how human beings perceive the environment through specific
rules of perceptual construction.
llusions are also a source of fascination, commonly used by
artists. In many cases two-dimensional art gains the appearance
of the third dimension through the use of techniques based
on principles revealed in illusions. One of the most notable
uses of such principles is found in the trompe d'oeil technique.
Other artists deliberately use illusion to entertain the observer
by creating impossible figures. The continued development
of such techniques, and the fascination they have for the
viewer, reflect both the endless creativity and the appreciation
for creativity that are to be found in human nature.
The study of illusions has focused on the visual system due
to the prevalence and diversity of optical illusions. Our
visual system faces a challenging task, attempting to correctly
represent reality while calculating and perceiving various
factors, such as light, color, texture, and size in a three-dimensional
environment. Visual perception is created by our brain's interpretation
of visual information and sometimes it results in fascinating
visual illusions. Our mind gets "actively" involved
in interpreting the perceptual input rather than passively
recording the input, though it does not always accurately
represent that input.
- 1. A mistaken perception of reality. 2.Being deceived by a
false perception or belief.
Optical illusion - 1. Of or relating to sight.
2.Relating to or using visible light
Environment - One’s physical surroundings.
Distortion - 1. A twists of fact or a misrepresentation.
2. A change in the shape of an image resulting from mistakes
by our eye.
Psychologist - A person trained and educated
to perform psychological research, like how the mind works and
why people do the things they do.
Cornea - The transparent, convex, part of the
eyeball that covers the iris and the pupil.
Transparent - Easily seen through; sheer.
Lens - A transparent, part of the eye that
focuses light rays entering through the pupil to form an image
on the retina.
Retina - The delicate light-sensitive part
of the inner eyeball, connected to the optic nerve to the brain.
Iris - The color, round, colored part of the
eye. It regulates the amount of light entering the eye.
Pupil - The black round opening in the center
of the iris, through which light passes to the retina.
Optic Nerve - The nerve that goes from the
retina, ling carry visual information to the brain.
Blind Spot - The small, round , region in the
retina where of the optic nerve meets the eyeball. It has no
rods or cones.
Traits - A important part, of a person's character.
Culture - The behavior, arts, beliefs, institutions,
of a group of people
Afterimage - A visual image that stays even
after the visual stimulus causing it is gone.
Background - The ground or scenery located
behind something. 2. The part of a picture that appears as if
it were in the distance.
Intersections - 1. A place where things intersect,
especially a place where two or more roads cross. 3. Mathematics.
The point where one line, surface, or solid crosses another.
Receptors - A special group of nerve endings
that responds to sensory stimuli such as light.
Contrast - Two different objects. Red berries
standing in contrast against the snow. 2. One thing that is
different from to another. 3. The use of opposing colors, objects,
or lines, next to each other to produce an strong effect in
a work of art.
Camouflage - The blending in of one thing into
its environment or natural surrounding. Disguise or protective
Altered - To change or make different
Superimposition - When two film clips are shown
at the same time
Mirage - An optical effect that is sometimes
seen at sea, in the desert, or over a hot pavement, that may
have the appearance of a pool of water or a mirror in which
distant objects are seen inverted. That is caused by the bending
or reflection of rays of light by a layer of heated air of varying
Perspective - The representation of three-dimensional
objects and depth relationships on a two-dimensional surface.
3. The appearance of objects in depth as see by normal vision.