September 10, 2014
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Transcript of September 10, 2014
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Sensation and PerceptionThe Basics of Signal Perception
Vision
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1. Sensory Reception
2. Sensory Transduction
3. Action Potentials4. Brain Processing
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Sensory Reception
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Sensory Transduction
StimulusReceptors
TranslationCell Body
Ah Hah!
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Resulting Action Potentials
Transduced signals are sent to the brain
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Brain Processing
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The minimum stimulus needed for the receptor to detect 50% of the time
Absolute Threshold
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This is different for each individual
Absolute Threshold
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Which helps explain things like pain tolerance
Absolute Threshold
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Difference Threshold
The minimum difference in stimulus intensity required for us to feel a difference.
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Difference Threshold
As the stimulus increases, so does the DT
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Signal Detection Theory
The fly in the ointment
We judge stimulus in order to decide whether to attend or not
We need to filter out all the craziness to focus
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The Rods and Cones are the Transducers
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Cones:
Bright VisionMany more
Packed in the center of the fovea
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Rods
Dark VisionFar fewer
Night visionShades of gray
Poor detail
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Color Perception
Color = Wavelengths
Brightness = Amplitude
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Visual Perception
Figure and Ground
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Grouping
Closure and
Contours
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Grouping
Proximity
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Bottom-Up Processing
From sensory input to processing:
We judge what we see based on processing AFTER input
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Top-Down Processing
Our pre-judgements affect what we really see
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Some optical illusions
http://www.buzzfeed.com/jessicamisener/crazy-optical-illusions#2cpkulg
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