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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

November 6th 2024

control–display ratio

control–display ratio

in ergonomics, the ratio between the distance that a control or input device (e.g., a computer mouse) is moved by the operator and the consequent distance that the object it controls (e.g., the cursor) is moved on the display (e.g., the computer screen).