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PLEASE COME! Receive 1 Hour Lab Experience Credit HERE, Thursday Bring 2 #2 Pencils. Psychology 150 Introduction to Psychology. Lecture 09 - 09/19/01 Finishing Perception – 2D 3D Attention?. Sample Problem: Depth Perception. Retina is a 2-D surface - How do you perceive depth? - PowerPoint PPT PresentationTRANSCRIPT
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PLEASE COME!PLEASE COME!
Receive 1 Hour Lab Receive 1 Hour Lab Experience CreditExperience Credit
HERE, ThursdayHERE, ThursdayBring 2 #2 Pencils Bring 2 #2 Pencils
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Psychology 150 Psychology 150 Introduction to PsychologyIntroduction to Psychology
Lecture 09 - 09/19/01• Finishing Perception – 2D 3D• Attention?
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Sample Problem:Sample Problem:Depth PerceptionDepth Perception
Retina is a 2-D surface - How do you perceive depth?
Two types of cues…
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Binocular CuesBinocular Cues
Binocular Disparity.
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Binocular CuesBinocular Cues
Binocular Disparity.– The less the disparity, the greater the
distance.– Sufficient for Depth Perception (stereopsis)
Eye Convergence
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Monocular Cues to DepthMonocular Cues to Depth
Motion Parallax
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Monocular Cues to DepthMonocular Cues to Depth
Motion ParallaxOcclusion
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Monocular Cues to DepthMonocular Cues to Depth
Motion ParallaxOcclusionRelative Image Size
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Monocular Cues to DepthMonocular Cues to Depth
Motion ParallaxOcclusionRelative Image SizeTexture Gradients & Linear Perspective
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Monocular Cues to DepthMonocular Cues to Depth
Motion ParallaxOcclusionRelative Image SizeLinear PerspectiveTexture GradientsPosition Relative to Horizon
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Problem: Problem: Perceptual ConstancyPerceptual Constancy
Our perception that properties of objects remain constant even when the conditions of stimulation are changed.
Example: Color Constancy– Is color perception solely a function of
wavelength?
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Top-Down Effect on Early Top-Down Effect on Early Perceptual ProcessingPerceptual Processing
Steven Palmer (1975)Theory:
Even Early Perceptual Processes are dependent upon the current cognitive state of the perceiver...
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Palmer’s ExperimentPalmer’s Experiment
Subjects: HumansTask: Look at Object 1, and then identify
a briefly flashed object (Object 2)
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Palmer’s ExperimentPalmer’s Experiment
Manipulation: Conceptual Relationship between Object 1 and Object 2 (consistent or inconsistent).
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Palmer cont...Palmer cont...
Measure: Percent Correct IdentificationPrediction: Consistent relationship
between object 1 and object 2 will increase perceptual identification.
Results...
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Palmer, 1975
020406080
100
Consistent Inconsistent
Relationship between Objects
Per
cen
t C
orr
ect
Iden
tifi
cati
on
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Summing Up PerceptionSumming Up PerceptionGoal: Stable representation of reality.Problem: Need to transduce “incomplete”
incoming stimulus energy and “construct” a percept.
Not a one-to-one relationship between stimulus and perception.
Behavioral study can guide neuroscience.Construction Project = Unconscious
Inference.
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Pay Attention:
Dropping Rocks and Frog Legs Ahead!
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&$%#* Brain Again&$%#* Brain Again
Nice device and all, but… – Finite!– Distracting Stimuli.
Attention: A mechanism for selection.Attention is a hypothetical construct.
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Dropping RocksDropping Rocks
How do you demonstrate the properties of gravity?
We need a dropping rock for cognition!
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Frog LegsFrog Legs
Helmholtz - Does nerve conduction take time?
If nerve conduction takes time….Reaction Time: The elapsed time between
the onset of a stimulus and the subject’s response.
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An example that puzzled me…An example that puzzled me…
Behavior Boy… takes a cognitive course...
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Background:Background:Basic Detection ParadigmBasic Detection Paradigm
Time 1 Time 2
*
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Sample Data for Visual Detection Task
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Rea
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(ms)