Cognition is a part of which Intelligence Theory?

J. P. Guilford's Structure-of-Intellect (SOI) model organises intelligence along three independent dimensions: Operations (the mental processes used, such as Cognition, Memory, Divergent Production, Convergent Production and Evaluation), Contents (the type of information involved: figural, symbolic, semantic, behavioural) and Products (the form the information takes: units, classes, relations, systems, transformations, implications). Crossing these dimensions generates a large number of distinct intellectual abilities, so the model treats intelligence as many separate, definable operations rather than one single general ability.

Cognition, the ability to discover, recognise and comprehend information, is one of the named Operations in this SOI structure. Since the question asks which theory treats cognition as an explicit structural component of intelligence, the theory that names cognition as one of its operations is Guilford's Theory.

• Sampling Theory (Godfrey Thomson) explains test performance through a very large pool of independent neural elements, or 'bonds', sampled differently for each task; it has no operation called cognition.

• Group Factor Theory (Thurstone's Primary Mental Abilities) splits intelligence into several independent primary abilities: verbal, numerical, spatial, memory, reasoning and the like, again without a labelled cognition operation.

• Fluid and Crystallized Theory (Cattell-Horn) divides general intelligence into fluid reasoning ability and crystallised, learned knowledge, a two-factor split, not an operation named cognition.

Because only the Structure-of-Intellect model lists cognition as one of its defining operations, Guilford's Theory is the correct answer.