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Intrapersonal psychological variables not only include cognitive abilities, but also enduring personality traits (both normal and abnormal), transitory emotional/mood states, and dynamic motivational traits (which are less stable than either abilities or personality traits, but more stable than mood states (cf. Boyle, 1987a; Cattell & Child, 1975). While ability and personality factors are largely independent with relatively minor overlap/redundancy across modalities (Boyle, 1988b; Boyle, Stanley, & Start, 1985), there are nevertheless, some discernible ability-trait interrelationships.
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