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

January 13th 2025

genetic psychology

the study of the development of mental functions in children and their transformation across the lifespan. In the 19th and early 20th centuries, the term was preferred over the synonymous developmental psychology.