Perceptual Reasoning Index

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The Perceptual Reasoning Index (PRI) is one of four derived indices from the Wechsler Intelligence Scale for Children, 4th edition (WISC-IV; Wechsler, 2003). Its primary purpose is to examine nonverbal fluid reasoning skills (i.e., the mental operations used to examine novel problems, organize thoughts, examine rules and logical relationships, and create and test solutions). Additionally, the PRI provides a direct assessment of cognitive processes including visual perception, visual-motor integration, visuospatial processing and coordination, and, to a lesser extent than its predecessor, mental/manual quickness and efficiency. The PRI is derived from a child’s performance on three core subtests: Block Design, Picture Concepts, and Matrix Reasoning, and emphasizes reasoning in solving the kinds of problems that are not taught in school. It is one of four composite scores that contribute to the overall index of global intellectual ability, the Ful ...