8/8/2019 u05 Perception Slides
1/35
Perceptionm1617
8/8/2019 u05 Perception Slides
2/35
8/8/2019 u05 Perception Slides
3/35
Perception
Perception
The process of organizing
and interpreting sensory
information.
Selective AttentionThe focusing of conscious
awareness on a particular
stimulus.
8/8/2019 u05 Perception Slides
4/35
Selective Attention
8/8/2019 u05 Perception Slides
5/35
McGurk Effect
8/8/2019 u05 Perception Slides
6/35
Perceptual Illusions
Franz Muller-Lyer Illusion.
Which segment is longer? AB or BC?
Text
AB is one-third longer than BC.
8/8/2019 u05 Perception Slides
7/35
Perceptual IllusionsSize-DistanceRelationship
Illusions help usunderstand perception.
8/8/2019 u05 Perception Slides
8/35
Size-Distance Relationship
8/8/2019 u05 Perception Slides
9/35
Are the horizontal lines parallel?
8/8/2019 u05 Perception Slides
10/35
8/8/2019 u05 Perception Slides
11/35
Perceptual OrganizationVisual Capture
Tendency for vision to dominate the other senses.
Grouping
The perceptual tendency to organize stimuli into
coherent groups.
Gestalt
Tendency to integrate pieces of information into a
meaningful whole.
8/8/2019 u05 Perception Slides
12/35
Form Perception:Figure and Ground
The organization ofthe visual field intoobjects (the figure)
that stand out fromtheir surroundings (theground).
8/8/2019 u05 Perception Slides
13/35
Form Perception:Grouping
8/8/2019 u05 Perception Slides
14/35
Depth PerceptionDepth Perception
The ability to see objects in three dimensions.
Allows us to judge distances.
Sources of Depth Perception
Binocular Cues
Monocular Cues
8/8/2019 u05 Perception Slides
15/35
8/8/2019 u05 Perception Slides
16/35
8/8/2019 u05 Perception Slides
17/35
Depth Perception:Binocular Cues
Retinal Disparity
Images from two eyes differ.
The closer the object, thegreater the difference.
Eg MagicEye
Convergence
The extent to which the eyesconverge when looking at anobject.
8/8/2019 u05 Perception Slides
18/35
8/8/2019 u05 Perception Slides
19/35
8/8/2019 u05 Perception Slides
20/35
8/8/2019 u05 Perception Slides
21/35
Depth Perception:Monocular Cues
Interposition - Closerobject blocks distantobject.
Relative Size - Smallerimage is more distant.
Relative Clarity- Hazyobject seen as more
distant.
Texture Gradient -Coarse = close and Fine =distant.
Relative HeightObjects higher in ourvision seem farther.
Relative Motion Thenearer an object, the fasterit moves.
Linear Perspective
Parallel lines seem toconverge at the horizon.
Light and ShadowFurther objects seem moredim.
8/8/2019 u05 Perception Slides
22/35
8/8/2019 u05 Perception Slides
23/35
Motion PerceptionAs an object movesacross our field ofvision, it is detected byopposing visualcortices.
Phi Phenomenon marquees.
StroboscopicMovement 24 framesper second.
8/8/2019 u05 Perception Slides
24/35
8/8/2019 u05 Perception Slides
25/35
8/8/2019 u05 Perception Slides
26/35
Phi Phenomenon
8/8/2019 u05 Perception Slides
27/35
Perceptual ConstancyPerceiving objects asunchanging despite
changes in retinal image.
Color
Shape
Size
8/8/2019 u05 Perception Slides
28/35
Perceptual ConstancySize-Distance Relationship
Linear Perspective uses context cues to tell
distance based on relative size.
8/8/2019 u05 Perception Slides
29/35
Perceptual Constancy
8/8/2019 u05 Perception Slides
30/35
Perceptual Constancy
Lightness Constancy
Relative luminance: the
amount of light an object
reflects relative to its
surroundings.
8/8/2019 u05 Perception Slides
31/35
Perceptual InterpretationSensory Deprivation.
There is a critical period
for developing featuredetector cells.
If deprived of a stimuliover a long period oftime, the brain loses theoriginal ability to processthat stimuli.
Eg Blakemore and Cooper,1970.
8/8/2019 u05 Perception Slides
32/35
Perceptual Interpretation
Perceptual AdaptationThe visual ability toadjust to an artificiallydisplaced visual field.
E.g. Prism glasses.
8/8/2019 u05 Perception Slides
33/35
8/8/2019 u05 Perception Slides
34/35
What doyou see onthe bottle?
You see whatyou want to
see
8/8/2019 u05 Perception Slides
35/35
Extrasensory PerceptionESP
The controversial claim thatperception can occur apartfrom sensory input.
A reproducible ESPphenomenon has never beendiscovered, nor has anyoneproduced any individual who
can convincinglydemonstrate psychic ability.
Telepathy
Mind-to-mind
communication.
Clairvoyance
Perceiving remote events.
Precognition
Perceiving future events.