PSYCHOLOGY (8th Edition) David Myers -...
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PSYCHOLOGY (8th Edition) David Myers
PowerPoint Slides Aneeq Ahmad
Henderson State University
Worth Publishers, © 2006
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Perception
Chapter 6
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Perception
Selective Attention
Perceptual Illusions
Perceptual Organization
Form Perception
Motion Perception
Perceptual Constancy
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Perception
Perceptual Interpretation
Sensory Deprivation and Restored Vision
Perceptual Adaptation
Perceptual Set
Perception and Human Factor
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Perception
Is there Extrasensory Perception?
Claims of ESP
Premonitions or Pretensions
Putting ESP to Experimental Test
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Perception
The process of selecting, organizing, and interpreting sensory information, which enables us
to recognize meaningful objects and events.
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Selective Attention
Perceptions about objects change from moment to moment. We can perceive different forms of the
Necker cube; however, we can only pay attention to one aspect of the object at a time.
Necker Cube
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Inattentional Blindness
Inattentional blindness refers to the inability to see an object or a person in our midst.
Simmons & Chabris (1999) showed that half of the observers failed to see the gorilla-suited assistant in a ball passing game.
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Change Blindness
Change blindness is a form of inattentional blindness in which two-thirds of individuals
giving directions failed to notice a change in the individual asking for directions.
© 1998 Psychonomic Society Inc. Image provided courtesy of Daniel J. Simmons.
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Perceptual Illusions
Illusions provide good examples in understanding how perception is organized. Studying faulty perception is as important as
studying other perceptual phenomena.
Line AB is longer than line BC.
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Tall Arch
In this picture, the vertical dimension of the arch looks longer than the
horizontal dimension.
However, both are equal.
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Illusion of a Worm
The figure on the right gives the illusion of a blue hazy “worm” when it is nothing else but blue lines identical
to the figure on the left.
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3-D Illusion
It takes a great deal of effort to perceive this figure in two dimensions.
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Perceptual Organization
When vision competes with our other senses, vision usually wins – a phenomena called visual
capture.
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
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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.
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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.
Inner
vis
ions
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Binocular Cues
Retinal 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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Binocular Cues
Convergence: Neuromuscular cues. When two eyes move inward (towards the nose) to see near objects and outward (away from the nose) to see
faraway objects.
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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.
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Monocular Cues
Relative Clarity: Because light from distant objects passes through more light than closer objects, we
perceive hazy objects to be farther away than those objects that appear sharp and clear.
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Monocular Cues
Texture Gradient: Indistinct (fine) texture signals an increasing distance.
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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.
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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.
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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.
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Motion Perception
Motion Perception: Objects traveling towards us grow in size and those moving away shrink in size. The same is true when
the observer moves to or from an object.
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Apparent Motion
Phi Phenomenon: When lights flash at a certain speed they tend to present illusions of motion. Neon signs use this principle to create motion
perception.
Two lights flashing one after the other. One light jumping from one point to another: Illusion of motion.
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Perceptual Constancy
Perceiving objects as unchanging even as illumination and retinal images change. Perceptual constancies include constancies of shape and size.
Shape Constancy
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Size Constancy
Stable size perception amid changing size of the stimuli.
Size 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.
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Size-Distance Relationship
Both 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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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.
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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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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 our perceptual interpretation?
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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.
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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.
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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.
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(a) Loch ness monster or a tree trunk; (b) Flying saucers or clouds?
Perceptual Set
Other examples of perceptual set.
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Children's schemas represent reality as well as their abilities to represent what they see.
Schemas
Schemas are concepts that organize and interpret unfamiliar information.
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Students recognized a caricature of Arnold Schwarzenegger faster than his actual photo.
Features on a Face
Face schemas are accentuated by specific features on the face.
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Eye & Mouth
Eyes and mouth play a dominant role in face recognition.
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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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Perception & Human Factors
Human Factor Psychologists design machines that assist our natural perceptions.
The knobs for the stove burners on the right are easier to understand than those on the left.
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Human Factors & Misperceptions
Understanding human factors enables us to design equipment to prevent disasters.
Two-thirds of airline crashes caused by human error are largely due to errors of perception.
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Human Factors in Space
To combat conditions of monotony, stress, and weightlessness when traveling to Mars, NASA
engages Human Factor Psychologists.
Transit Habituation (Transhab), NASA
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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
Paranormal phenomena include astrological predictions, psychic healing, communication with the dead, and out-of-body experiences, but most
relevant are telepathy, clairvoyance, and precognition.
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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.
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Premonitions or Pretensions?
Can psychics see the future? Can psychics aid police in identifying locations of dead bodies? What about psychic predictions of the famous
Nostradamus?
The answers to these questions are NO! Nostradamus’ predictions are “retrofitted” to
events that took place after his predictions.
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Putting ESP to Experimental Test
In an experiment with 28,000 individuals, Wiseman attempted to prove whether or not one can psychically influence or predict a coin toss.
People were able to correctly influence or predict a coin toss 49.8% of the time.