The Difference Threshold Is Not Fixed

This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.

State

The difference threshold changes with the starting intensity of the stimulus rather than holding at one fixed amount.

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One added candle is detectable against ten and undetectable against a hundred.

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This is why loudness, weight, and brightness controls are built on proportions rather than fixed steps.

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