Ostwald color system

a method of organizing chromatic and achromatic samples. The system consists of 24 hues arranged around the outside of a circle, with the complementary colors for each hue located along the circle’s diameters. By combining adjacent colors, any color on the Ostwald scale can be produced. [Wilhelm Ostwald (1853–1932), German chemist and physicist]

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Psychology term of the day

February 17th 2025

sexually dimorphic nucleus

a nucleus of the central nervous system that differs in size between males and females. In humans, for example, a nucleus in the medial preoptic area of the hypothalamus that synthesizes gonadotropin-releasing hormone tends to be larger and more active in males than in females because gonadotropin release is continuous (it is cyclical in females). In songbirds whose males sing more than females, several brain nuclei associated with both song learning and song production are larger in males than in females.