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A/S ratio
Association/sensation ratio, an index of the comparative intelligence of mammalian species formulated by the Canadian psychologist Donald O(lding) Hebb (1904–85), defined as brain volume devoted to ...
intelligence
The coordination of memory, learning, and reasoning in animals. Intelligence has also been defined as the ability of an animal to form associative links between events or objects of which it has had ...
progression index
An index of the comparative intelligence of mammalian species, based on a modification of the encephalization quotient, defined as volume of neocortex in the animal in question divided by volume of ...