The Wechsler Scales
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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The Wechsler scales are standardized intelligence tests reporting verbal and performance indices as well as a full-scale score.
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An adult with strong verbal comprehension and weak processing speed produces an unremarkable full-scale score.
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The index scores are what clinicians use. The full-scale figure is the one the public knows.