Fluid abilities (fluid intelligence) according to Cattell are biologically determined and are reflected in memory span, reasoning, and most tests of spatial thinking.

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Fluid intelligence, as defined by Raymond Cattell, is indeed considered to be largely biologically determined and encompasses the capacity to think logically and solve problems in novel situations, independent of acquired knowledge. It includes abilities such as memory span, reasoning, and spatial thinking.

Fluid Abilities (Fluid Intelligence) According to Cattell Are Biologically Determined