3. WHAT IS PERCEPTION
• THE PROCESS BY WHICH AN
INDIVIDUAL
SELECTS, ORGANISES, AND
INTERPRETS STIMULI INTO A
MEANINGFUL AND COHERENT
PICTURE OF THE WORLD.
10. PERCEPTION
• The images are actually identical, but the tower on the right seems
to lean more because the human visual system treats the two
images as one scene.
• Our brains are conditioned to expect parallel towers to converge
toward a common vanishing point, but because the tower on the
right does not converge, our visual system interprets that it is
leaning at a different angle
• . A common example of this conditioning is the way 3D movies
and 3D TVs trick our minds into believing that images are actually
coming out of the screen, when in fact they are not. Our minds are
conditioned to believe 3D images move in 3 dimensions.
• With a bit of technical help, we can trick our minds into visualizing
this on a 2D screen. Below is a perspective drawing with three
vanishing points of what our eyes expect
11. • Hold your head steady and fix your eyes on
the dot in the center of the picture. The
colored dots will seem to disappear in a few
seconds. The effect is due to retinal
fatigue which occurs when the afterimage of
an object cancels the stimulus of the object on
the retina. The effect is most pronounced
when the objects do not have well-defined
edges that are detectable by small eye
movements
12. • The circles appear to rotate when you move
your head closer and further away from the
screen while looking at the dot in the center.
Our peripheral vision interprets the relative
increase or decrease of the image in the retina
as rotational motion of the slanted lines.
23. • Blind Spot Experiment
The retina is the part of the eye covered with
receptors that respond to light. A small
portion of the retina where the optic nerve
connects to the brain has no receptors. An
image that falls on this region will not be seen.
Close your right eye.
24. Close your right eye. With your left eye, look at
the L below. Slowly move your head closer or
further away from the screen while looking at
the L. The R will disappear when your head is
approximately 50 cm (20 in) from the screen.
You can repeat the experiment with your right
eye by looking at the R.
35. PERCEPTION
Illusory Contours
Although there are only circles with sections
taken out of them, our eyes strive to see
triangles. The sides of the triangles may
appear curved when the angles of the sections
do not add up to 180 degrees
36.
37.
38. PERCEPTION
Rotating Wheels
The circles appear to rotate when you move
your head closer and further away from the
screen while looking at the dot in the center.
Our peripheral vision interprets the relative
increase or decrease of the image in the retina
as rotational motion of the slanted lines.
39.
40. PERCEPTION
• Warped Squares?
There are no curved lines in these figures. You
can use a ruler to check it out.
The diagonal patterns created by the tiny
squares distort the perception of the pictures
43. PERCEPTION
• Shifting gears
Afterimages of complementary
colors create apparent
movement in our peripheral
vision
as our eyes shift across the
page
44.
45. PERCEPTION
• A portion of misplaced
lines can be clearly
identified as forming a
circle, even when there is
no outline of a circle
72. • PRESENTED BY
• Dr.KESIRAJU RAMPRASAD
• EDUCATIONAL
PSYCHOLOGIST AND
COUNSELOR
73. • THANKS TO MANY PEOPLE WHO
CONTRIBUTED GREAT KNOWLEDGE ABOUT
THE PERCEPTION CONCEPT.
• MY GREATFUL THANKS TO ALL THE GREAT
PEOPLE WHO CONTRIBUTED TO PREPARE THIS
SLIDE.