Necker cube

a line drawing of a cube in which all angles and sides can be seen, as if it were transparent. It is an ambiguous figure whose three-dimensionality fluctuates when viewed for a prolonged period of time. [Louis Albert Necker (1730–1804), Swiss crystallographer]

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Psychology term of the day

May 9th 2024

node of Ranvier

any of successive regularly spaced gaps in the myelin sheath surrounding an axon. The gaps permit the exchange of ions across the plasma membrane at those points, allowing the nerve impulse to leap from one node to the next in so-called saltatory conduction along the axon. [Louis A. Ranvier (1835–1922), French pathologist]