Bloch’s law

a rule of temporal summation stating that visual threshold is reached when luminance × duration reaches a constant. If the brightness of a stimulus is halved, the stimulus can still be detected if its duration is doubled. Bloch’s law only holds for relatively brief (≤100 ms), dim stimuli. Also called Bunsen–Roscoe law.

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Psychology term of the day

May 9th 2024

sudden unexpected nocturnal-death syndrome

see nightmare-death syndrome.