Transcript Perception - Raleigh Charter High School

Perception
How we organize and interpret
sensory information
Selective Attention Video
In the following video, you will see people
dressed in either black or white passing a
basketball. You must count the number of
chest passes and bounce passes made by
the players dressed in WHITE.
Selective attention - we can only focus
awareness on a limited part of what we
are sensing.
Cocktail party effect –
type of selective
attention in which you
can attend to only one
voice at a time
Cell phones and
driving? Listening to
music and studying?
Visual Capture
 The tendency for
vision to dominate
your senses.
 At an IMAX movie, it
feels like you are
moving because it
looks like you are
moving. Your vision
dominates over your
vestibular system.
Parallel processing –
processing many things at once
Man who mistook his wife for a hat – could
see form but not the big picture
Colorblindness with functional cones
Motion blindness
Blindsight
Perceiving Images
The first step in
perceiving an image
is determining the
figure and ground.
Gestalt and the Urge to Organize
Gestalt and the blind spot
Other gestalt principles
More gestalt
And more gestalt
Motion Perception
How does the brain recognize an object is
moving? How does it interpret the direction of
movement?
Brain interprets
shrinking objects as
receding and
enlarging objects as
approaching
Stroboscopic Effect
the perception of motion produced by
a rapid succession of slightly varying
images (animation, movies)
Phi phenomenon
an illusion created when two or more
adjacent lights blink on and off in
succession, creating the perception
of movement (lighted signs, illusions)
Motion Perception
Objects that are farther away appear to be
moving more slowly. Think of a plane in
the sky or a truck in the distance
Perceptual Constancy
the ability to perceive an object is the same even as the illumination
and retinal image changes.
Shape Constancy- perception that shape of an
object doesn’t change just because image on
the retina does.
How many right angles do you see?
Perceptual Constancy
Size constancy (King Koch or the
incredibly shrinking teacher) – perception
that an object’s size remain the same even
as the retinal image changes.
Perceptual Constancy
Color Constancy – the perception that
familiar objects have a consistent color,
even if changing illuminations alter the
wavelength reflected.
Perceptual Constancy
Lightness constancy – the perception that
familiar objects have a constant lightness,
even while illumination varies.
Size-distance relationship
When other monocular cues tell us
an image is further away, it actually
appears larger.
Moon illusion
Imagine you are outside on a clear night in
which there are no clouds and that is a
bright full moon. Pretend that you are
going to pick up one of the following
objects that when held at arm’s length just
covers up the moon.
Moon Illusion Objects
Imagine the moon is straight overhead.
BB
Pea
Softball
Small Salad Plate
Dime
Penny
Nickel
Quarter
Large Salad Plate
Frisbee
Basketball
Golf ball
Baseball
Beach ball
Moon Illusion
Now imagine the horizon moon.
BB
Softball
Pea
Small Salad Plate
Dime
Large Salad Plate
Penny
Frisbee
Nickel
Basketball
Quarter
Beach ball
Golf ball
Baseball
Moon Illusion
What object do you
need?
A pea! For both the
overhead and
horizon moon.
Muller-Lyon Illusion
Which is longer?
Muller-Lyon Illusion
Perceptual Adaptation
Perceptual Set
TIME FLIES I CANT THEYRE TOO FAST
FOLK
MacDonald
CROAK
MacHenry
Machinery
SOAK
MacMahon
Unscramble in order.
List A
List B
LULB
NORC
CALEM
NOONI
BAZER
MATOOT
SEUMO
PREPPE
NUKKS
TEBE
EAP
EAP
Context Effects
Extrasensory Perception
Telepathy – mind reading
Clairvoyance – perceiving remote events
Precognition – Knowing things before they
happen
Telekinesis (psychokinesis) – moving
objects with one’s mind (not technically
ESP)