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Sensation & Perception
Weber’s Law – the observation that the amount
of stimulus increase or decrease required to
discern a change, divided by the original
stimulation, is a constant
Can you tell the difference between a 105-watt
bulb and a 100-watt bulb?
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Vision = 8%
Audition = 5%
30 –decibel tone / perceive change at 31.5-db
1.5/30 = 5 percent
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Absolute Threshold
Minimum amount of stimulus energy required for
conscious detection of a stimulus 50% of the time
by the individuals tested
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Vision
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Dog’s Vision
Humans have 3 types of cones (3 colors)
Dogs have 2 types
Someone who is “colorblind” may have only 2 types
Consider bright red dog toy in green grass of yard…
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Hearing
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Visual perception
Ames Room
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Poggendorf Illusion
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Ponzo Illusion
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Hering Illusion
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Rotate
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Hermann Grid
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Hermann - Hering Illusion
Stare at the black dot for 30 to 60 seconds. Then
quickly change to stare at the white dot.
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Zollner
Poggendorff
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Fraser Spiral
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Zollner
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Mach Bands
Edge Enhancement Illusion
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Ouchi Illusion
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Perceptual Organization-
Brightness Contrast
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the donguri
wave
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Ebbinghaus Illusion
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Blue Squares are not slanted
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Motion
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