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Transcript of Priming 1. 2 PSYCHOLOGY (9th Edition) David Myers PowerPoint Slides Aneeq Ahmad Henderson State...
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Priming
1
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PSYCHOLOGY(9th Edition)
David Myers
PowerPoint SlidesAneeq Ahmad
Henderson State University
Worth Publishers, © 2010
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Sensation and Perception
Chapter 6
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Sensation
Sensing the World:Some Basic Principles Thresholds Sensory Adaptation
Vision The Stimulus Input: Light Energy The Eye Visual Information Processing Color Vision
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Hearing The Stimulus Input: Sound Waves
The Ear
Hearing Loss and Deaf Culture
Other Important Senses Touch
Pain
Taste
Smell
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Perceptual Organization Form Perception
Depth Perception
Motion Perception
Perceptual Constancy
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Perceptual Interpretation Sensory Deprivation and
Restored Vision
Perceptual Adaptation
Perceptual Set
Perception and the Human Factor
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Is There Extrasensory Perception? Claims of ESP
Premonitions or Pretensions?
Putting ESP to Experimental Test
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Sensation & Perception
How do we construct our representations of the external world?
To represent the world, we must detect physical energy (a stimulus) from the
environment and convert it into neural signals. This is a process called sensation.
When we select, organize, and interpret our sensations, the process is called perception.
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Bottom-up Processing
Analysis of the stimulus begins with the sense receptors and works up to the level of
the brain and mind.
Letter “A” is really a black blotch broken down into features by the brain that we perceive as an
“A.”
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Top-Down Processing
Information processing guided by higher-level mental processes as we construct perceptions, drawing on our experience
and expectations.
THE CHT
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Our sensory and perceptual processes work together to help us sort out complex images.
Making Sense of Complexity
“The Forest Has Eyes,” Bev Doolittle
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Sensing the World
Senses are nature’s gift that suit an organism’s needs.
A frog feeds on flying insects; a male silkworm moth is sensitive to female sex-attractant odor; and we as human beings are sensitive to sound frequencies that represent the range of human voice.
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Exploring the Senses
What stimuli cross our threshold for conscious awareness?
inattentional blindness
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Psychophysics
A study of the relationship between physical characteristics of stimuli and
our psychological experience with them.
Physical WorldPsychological
World
Light Brightness
Sound Volume
Pressure Weight
Sugar Sweet
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Thresholds
Absolute Threshold: Minimum stimulation needed to detect a particular stimulus 50% of the time.
Pro
port
ion
of
“Yes”
Resp
on
ses
0.0
0
0
.50
1.0
0
0 5 10 15 20 25 Stimulus Intensity (lumens)
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Subliminal Threshold
Subliminal Threshold: When stimuli are below one’s absolute threshold for conscious awareness.
Kurt Scholz/ Superstock
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Weber’s Law
Two stimuli must differ by a constant minimum percentage (rather than a constant amount), to be perceived as
different. Weber fraction: k = I/I.
StimulusConstant
(k)
Light 8%
Weight 2%
Tone 3%
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Sensory Adaptation
Diminished sensitivity as a consequence of constant stimulation.
Put a band aid on your arm and after awhileyou don’t sense it.
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Now you see, now you don’t
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Vision
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Transduction
In sensation, the transformation of stimulus energy (sights, sounds, smells) into neural
impulses.
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VisibleSpectrum
The Stimulus Input: Light Energy
Bot
h P
hoto
s: T
hom
as E
isne
r
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Physical Characteristics of Light
1. Wavelength (hue/color)
2. Intensity (brightness)
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Wavelength (Hue)
Hue (color) is the dimension
of color determined by the wavelength
of the light.
Wavelength is the distance
from the peak of one wave to the peak of the
next.
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Wavelength (Hue)
Different wavelengths of light resultin different colors.
400 nm 700 nmLong wavelengthsShort wavelengths
Violet Indigo Blue Green Yellow Orange Red
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Intensity (Brightness)
Intensity: Amount of energy in a
wave determined
by the amplitude. It is related to perceived
brightness.
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Intensity (Brightness)
Blue color with varying levels of intensity.As intensity increases or decreases, blue color
looks more “washed out” or “darkened.”
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The Eye
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Parts of the eye
1. Cornea: Transparent tissue where light enters the eye.
2. Iris: Muscle that expands and contracts to change the size of the opening (pupil) for light.
3. Lens: Focuses the light rays on the retina.
4. Retina: Contains sensory receptors that process visual information and sends it to the brain.
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The LensLens: Transparent
structure behind the pupil that changes
shape to focus images on the retina.
Accommodation: The process by which the eye’s lens changes shape to help focus
near or far objects on the retina.
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Retina
Retina: The light-sensitive inner
surface of the eye, containing
receptor rods and cones in addition to layers of other neurons (bipolar,
ganglion cells) that process
visual information.
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Optic Nerve, Blind Spot & Fovea
http://www.bergen.org
Optic nerve: Carries neural impulses from the eye to the brain. Blind Spot: Point where the optic nerve leaves the eye because there are no receptor cells located there. Fovea: Central point in the retina around which the eye’s cones cluster.
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Test your Blind Spot
Use your textbook. Close your left eye, and fixate your right eye on the black dot. Move the page towards your eye and away from
your eye. At some point the car on the right will disappear due to a blind spot.
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Photoreceptors
E.R. Lewis, Y.Y. Zeevi, F.S Werblin, 1969
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Bipolar & Ganglion Cells
Bipolar cells receive messages from photoreceptors and transmit them to
ganglion cells, which converge to form the optic nerve.
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Visual Information Processing
Optic nerves connect to the thalamus in the middle of the brain, and the thalamus
connects to the visual cortex.
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Feature Detection
Nerve cells in the visual cortex respond to specific features, such as edges, angles,
and movement.
Ros
s K
inna
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Alls
port
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Shape Detection
Specific combinations of temporal lobe activity occur as people look at shoes,
faces, chairs and houses.
Isha
i, U
nger
leid
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and
Hax
by/ N
IMH
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Feature detectors
• visual information processing
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Visual Information Processing
Processing of several aspects of the stimulus simultaneously is called parallel processing. The
brain divides a visual scene into subdivisions such as color, depth, form, movement, etc.
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From Sensation to Recognition
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Color VisionTrichromatic theory: Young and von
Helmholtz suggested that the eye must contain three receptors that are sensitive to
red, blue and green colors.
Blue Green Red
Medium LowMax
Standard stimulus
Comparison stimulus
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Color Blindness
Ishihara Test
Genetic disorder in which people are blind to green or red colors. This supports the
Trichromatic theory.
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Opponent Colors
Gaze at the middle of the flag for about 30Seconds. When it disappears, stare at the dot and report
whether or not you see Britain's flag.
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Hearing
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Hearing
The Stimulus Input: Sound Waves
Sound waves are compressing and expanding air molecules.
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Sound Characteristics
1. Frequency (pitch)2. Intensity
(loudness)
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The Ear
Dr. Fred H
ossler/ Visuals U
nlimited
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The Ear
Outer Ear: Collects and sends sounds to the eardrum.
Middle Ear: Chamber between eardrum and cochlea containing three tiny bones (hammer, anvil, stirrup) that concentrate the vibrations of the eardrum on the cochlea’s oval window.
Inner Ear: Innermost part of the ear, containing the cochlea, semicircular canals, and vestibular sacs.
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Cochlea
Cochlea: Coiled, bony, fluid-filled tube in the inner ear that transforms sound
vibrations to auditory signals.
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Intensity (Loudness)
Intensity (Loudness):
Amount of energy in a wave,
determined by the amplitude, relates to the perceived
loudness.
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Loudness of Sound
70dB
120dB
Richard K
aylin/ Stone/ Getty Im
ages
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Frequency (Pitch)
Frequency (pitch): The dimension of
frequency determined by the wavelength
of sound.
Wavelength: The distance from
the peak of one wave to the peak
of the next.
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Localization of Sounds
Because we have two ears, sounds that reach one ear faster than the other ear
cause us to localize the sound.
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Localization of Sound
1. Intensity differences2. Time differences
Time differences as small as 1/100,000 of a second can cause us to localize sound. The head acts as a “shadow” or partial sound
barrier.
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Touch
The sense of touch is a mix of four distinct skin senses—pressure, warmth, cold, and pain.
Bru
ce A
yers
/ Sto
ne/ G
etty
Im
ages
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Skin Senses
Only pressure has identifiable receptors. All other skin sensations are variations of
pressure, warmth, cold and pain.
Burning hot
Pressure Vibration Vibration
Cold, warmth and pain
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Pain
Pain tells the body that something has gone wrong. Usually pain results from damage to the skin and other tissues. A rare disease exists in
which the afflicted person feels no pain.
Ashley Blocker (right) feels neither painnor extreme hot or cold.
AP Photo/ Stephen M
orton
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Biopsychosocial Influences
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Gate-Control Theory
Melzack and Wall (1965, 1983) proposed that our spinal cord contains neurological “gates” that either block pain or allow it to
be sensed.
Gary C
omer/ PhototakeU
SA.com
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Pain Control
Pain can be controlled by a number of therapies including, drugs, surgery,
acupuncture, exercise, hypnosis, and even thought distraction.
Todd R
ichards and Aric V
ills, U.W
. ©
Hunter H
offman, w
ww
.vrpain.com
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Taste
Traditionally, taste sensations consisted of sweet, salty, sour, and bitter tastes.
Recently, receptors for a fifth taste have been discovered called “Umami”.
Sweet Sour Salty Bitter Umami(Fresh
Chicken)
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Sensory Interaction
When one sense affects another sense, sensory interaction takes place. So, the
taste of strawberry interacts with its smell and its texture on the tongue to produce
flavor.
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SmellLike taste, smell is a chemical sense.
Odorants enter the nasal cavity to stimulate 5 million receptors to sense smell. Unlike taste, there are many different forms of
smell.
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Smell and Memories
The brain region for smell (in red) is
closely connected with the brain
regions involved with memory (limbic system). That is why strong memories are
made through the sense of smell.
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• Location of rods and cones: • Organize students into experimenters and participants. • Give the experimenters red, blue, yellow, and green pencils. Tell
participants to stare straight ahead at some fixed spot without moving their eyes.
• Then have experimenters stand behind the participants and move each pencil from the back toward the front of the participant’s head.
• Have each participant say when he or she sees the pencil and when she can identify the color.
• Experimenters record the results for each color pencil. • (Students will see the pencil before the color. Also, because blue
and yellow cones extend farther in the periphery, students should see these colors sooner.)
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optical illusions
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Body Position and Movement
The sense of our body parts’ position and movement is called kinesthesis. The
vestibular sense monitors the head (and body’s) position.
http
://ww
w.h
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kam
ag
azin
e.co
m
Whirling Dervishes Wire Walk
Bob D
aemm
rich/ The Im
age Works
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Perceptual Organization
How do we form meaningful perceptions from sensory information?
We organize it. Gestalt psychologists showed that a figure formed a “whole”
different than its surroundings.
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Organization of the visual field into objects (figures) that stand out from their
surroundings (ground).
Form Perception
Tim
e Savings S
uggestion, © 2003 R
oger Sheperd.
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Grouping
After distinguishing the figure from the ground, our perception needs to organize the figure into a meaningful form using
grouping rules.
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Grouping & Reality
Although grouping principles usually help us construct reality, they may occasionally lead us
astray.
Both photos by W
alter Wick. R
eprinted from G
AM
ES
Magazine. .©
1983 PCS G
ames L
imited Partnership
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Depth Perception
Visual Cliff
Depth perception enables us to judge distances. Gibson and Walk (1960) suggested that human infants (crawling age) have depth perception. Even newborn animals show depth perception.
Inne
rvis
ions
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Binocular CuesRetinal disparity: Images from the two eyes differ. Try looking at your two index fingers when pointing them
towards each other half an inch apart and about 5 inches directly in front of your eyes. You will see a
“finger sausage” as shown in the inset.
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Monocular Cues
Relative Size: If two objects are similar in size, we perceive the one that casts a
smaller retinal image to be farther away.
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Monocular Cues
Interposition: Objects that occlude (block) other objects tend to be perceived as
closer.R
ene Magritte, The B
lank Signature, oil on canvas, N
ational Gallery of A
rt, Washington. C
ollection of M
r. and Mrs. Paul M
ellon. Photo by Richard C
arafelli.
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Monocular Cues
Relative Height: We perceive objects that are higher in our field of vision to be farther away than those that are
lower.
Image courtesy of S
haun P. V
ecera, Ph. D
., adapted from
stimuli that appered in V
ecrera et al., 2002
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Monocular Cues
Relative motion: Objects closer to a fixation point move faster and in opposing direction to those objects that are farther away from a fixation
point, moving slower and in the same direction.
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Monocular Cues
Linear Perspective: Parallel lines, such as railroad tracks, appear to converge in the distance. The more the lines converge, the
greater their perceived distance.
© T
he New
Yorker C
ollection, 2002, Jack Ziegler
from cartoonbank.com
. All rights reserved.
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Monocular Cues
Light and Shadow: Nearby objects reflect more light into our eyes than more distant objects. Given two identical objects, the dimmer one appears to
be farther away.
From
“Perceiving S
hape From
Shading” by V
ilayaur S
. Ram
achandran. © 1988 by S
cientific Am
erican, Inc. A
ll rights reserved.
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Perceptual Constancy
Perceiving objects as unchanging even as illumination and retinal
images change.
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Perceiving familiar objects as having consistent color even when changing illumination filters
the light reflected by the object.
Color Constancy
Color Constancy
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Size-Distance Relationship
The distant monster (below, left) and the top red bar (below, right) appear bigger
because of distance cues.
From Shepard, 1990
Alan C
hoisnet/ The Im
age Bank
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Size-Distance RelationshipBoth girls in the room are of similar
height. However, we perceive them to be of different heights as they stand in the
two corners of the room.
Both photos from S. Schwartzenberg/ The Exploratorium
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Size-Distance Relationship
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Ames Room
The Ames room is designed to demonstrate the size-distance illusion.
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Lightness Constancy
The color and brightness of square A and B are the same.
Courte
sy E
dwar
d A
delso
n
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Perceptual Interpretation
Immanuel Kant (1724-1804) maintained that knowledge comes from our inborn ways of
organizing sensory experiences.
John Locke (1632-1704) argued that we learn to perceive the world through our
experiences.
How important is experience in shaping ourperceptual interpretation?
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Sensory Deprivation & Restored Vision
After cataract surgery, blind adults were able to regain sight. These
individuals could differentiate figure and ground relationships, yet they had difficulty distinguishing a circle
and a triangle (Von Senden, 1932).
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Facial Recognition
After blind adults regained sight, they
were able to recognize distinct features, but
were unable to recognize faces.
Normal observers also show difficulty in facial recognition when the
lower half of the pictures are changed.
Courtesy of R
ichard LeG
rand
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Kittens raised without exposure to horizontal lines later had difficulty
perceiving horizontal bars.
Blakemore & Cooper (1970)
Sensory Deprivation
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Perceptual Adaptation
Visual ability to adjust to an
artificially displaced visual field, e.g., prism glasses.
Courtesy of H
ubert Dolezal
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Perceptual Set
A mental predisposition to perceive one thing and not another. What you see in the center picture is influenced by flanking pictures.
From
Shepard, 1990.
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(a) Loch ness monster or a tree trunk; (b) Flying
saucers or clouds?
Perceptual Set
Other examples of perceptual set.
Frank Searle, photo Adam
s/ Corbis-Sygm
a
Dick R
uhl
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Is the “magician cabinet” on the floor or hanging from the ceiling?
Context Effects
Context can radically alter perception.
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To an East African, the woman sitting is balancing a metal box on her head, while the family is sitting
under a tree.
Cultural Context
Context instilled by culture also alters perception.
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Perception Revisited
Is perception innate or acquired?
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Is There Extrasensory Perception?
Perception without sensory input is called extrasensory perception (ESP). A large
percentage of scientists do not believe in ESP.
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Claims of ESP
1. Telepathy: Mind-to-mind communication. One person sending thoughts and the other receiving them.
2. Clairvoyance: Perception of remote events, such as sensing a friend’s house on fire.
3. Precognition: Perceiving future events, such as a political leader’s death.