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In the extreme group method of item analysis,
Absolute Threshold
Absolute threshold is the minimum intensity of a stimulus that one can perceive 50% of the time, marking the boundary at which a stimulus becomes detectable to the senses.
Subliminal Threshold
The level below which a stimulus is not strong enough to be perceived or consciously noticed, yet may influence behavior or cognition.
Adaptation Threshold
The point at which a stimulus is of sufficient intensity to begin to produce an effect or be noticed.
Difference Threshold
The smallest amount of change needed in a stimulus for it to be detected as noticeably different from a reference stimulus.
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