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/ Name that perceptual law!
Can you name the law in visual perception?
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Some may be principles and not laws. Schwartz, Steven H. Visual Perception: A Clinical Orientation. New York: McGraw-Hill, Health Pub. Division, 2004. Print.
Once a quantum of light is absorbed, all information regarding it's wavelength is loss
Wavelength only determines probability of absorption (p.29)
For the light adaptation curve, as the background intensity is increase the 'increment intensity' (stimulus) must be increased at a constant ratio
when Ib vs Delta I is graphed on a logarithmic scale, this leads to a slope of 1. This occurs in area '3' of the scotopic light adaptation curve.
For the light adaptation curve. 'The background is so dim that fluctuations inherent in the light source that produces it play a primary role in determining threshold.' -Schwartz
Slope = 1/2. Occurs in 'section 2' of light adaptation curve
Law that assumes Weber's law also works when we're suprathreshold
S = K log (I); This law does not match experimental data. Stevens' Power Law does.
Law that has to deal with spatial summation. States for stimuli smaller than the critical diameter we don't care about stimulus intensity and stimulus area independently. Detection
Temporal summation equivalent of the law above. For stimuli SHORTER than the CRITICAL DURATION.
The critical duration is 100ms scotopic, 10ms photopic.
Rays which enter the cones perpendicular to their surface will appear brighter.
Only for CONES
The critical flicker fusion is proportional to the log of retinal illumination
Suprathreshold light flashes appear brightest when lasting between 50-100 ms.
Flickering light appears brighter than steady light with the same average luminance
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