Objective vs. Subjective Thresholds

• Our old friend thresholds
• An example from the Human Factors Field

CRT in the dark

CRT in 1000 fC Illumination

CRT in 10,000 fC Illumination

• Tests used to develop automatic adjustment for cockpit displays (Silverstein & Merrifield, 1985)

• Pilots adjust luminance up from necessary level.  Not change performance but comfort.

• So, is difference between Forced-Choice and Method of Constant Stimuli thresholds awareness or comfort?

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