reasoning, knowledge, quantitative reasoning, visual spatial reasoning, working memory. Deviation IQ: 68% of people within 1 standard deviation. WISC: WPPSI-R (preschool and primary scale revised), WISC-IV (scale for children), WAIS-R (scale for adults). Indexes: verbal comprehension, perceptual reasoning, working memory, processing speed. Stability of intelligence: middle adulthood correlates greatly but by age 3 there is a .45 correlation. High spurts and plateaus could result in low IQ stability…
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