Schröder staircase

an ambiguous figure of a staircase, which can be perceived as seen either from above or from underneath the stairs, depending on the perspective of the observer. It is often confused with the staircase illusion. [Heinrich Schröder (1810–1885), German bacteriologist and educator]

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Psychology term of the day

November 22nd 2024

population variance

(symbol: σ²) the square of the population standard deviation. It is a measure reflecting the spread (dispersion) of scores in a complete population of interest (e.g., the test scores of all students at a school).