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?

Vision = 8%

Audition = 5%

30 –decibel tone / perceive change at 31.5-db

1.5/30 = 5 percent

Absolute Threshold

Minimum amount of stimulus energy required for

conscious detection of a stimulus 50% of the time

by the individuals tested

Vision

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…

Hearing

Visual perception

Ames Room

Poggendorf Illusion

Ponzo Illusion

Hering Illusion

Rotate

Hermann Grid

Hermann - Hering Illusion

Stare at the black dot for 30 to 60 seconds. Then

quickly change to stare at the white dot.

Zollner

Poggendorff

Fraser Spiral

Zollner

Mach Bands

Edge Enhancement Illusion

Ouchi Illusion

Perceptual Organization-

Brightness Contrast

the donguri

wave

Ebbinghaus Illusion

Blue Squares are not slanted

Motion