This Presentation is about optical illusions and visual perceptions based on a Nat Geo Channel Program.

1. WHAT DO U SAY IF I SAY THAT
YOU ALL HAVE AN X RAY VISION
JUST LIKE SUPERMAN ?

2. JUST FOLLOW THE IMAGE

3. Please read the sign below

4. OPTICAL
ILLUSIONS

5. ~An optical illusion is charectarised by
visually perceved images that differ from
objective reality.
~The information gathered by our eye is
processed in the brain to give a perception
that does not tally with a physical
measurement of the stimulus source.

6. Optical illusions are classified into
many types.some of the important
classifications are :-
->Congnitive Illusions
->unconscious Inference
->Visual Perceptions

7. COGNITIVE ILLUSIONS :
//Cognitive illusions are assumed to arise by
interaction with assumptions about the world
leading to ‘UNCONCIOUS INFERNCE’
//It was invented by a German Physicist &
physician “HERMAN HELMHOLTS”.
This Illusion is again divided into 4 parts. They
are :-
>Ambiguous Illusions , Distoring , Paradox ,
Fictions.

8. Some of Cognitive Illusions

9. VISUAL PERCEPTIONS
•
~Illusions can be based on an individual ability to see in 3-dimensional
even through the image is 2- dimensional.
•
PONZO ILLUSION is one such Illusion.
•
~In Ponzo Illusion the converging parallel lines tells the brain that the
image higher in the visual field is farther away then the brain percives
the image to be larger even though the two images hitting the retina at
the same time.

10. ~Even when we are moving a vehicle
sometimes we assume that we are in rest
and the surroundings are in motion.

11. According to ‘MARK CHANGIZI’ of
Rensseler Polytechnic Institute of
New York, the optical ilusions are due
to a nural lag which most humans
experience while awake.
~When light hits the retina about 1/10
of a second goes by before the brain
translates the signal into a visual
perceptions of the world.

12. Opthamologist Albert Ames . Jr
who was influenced by the writings
of Herman Helmholts created a
room called Ames room in 1935.

13. PINUMALLA SUMANTH
MECHANICAL A1
ROLL NO .14C41A0343