The FSIQ is a composite score that represents overall cognitive ability, calculated by combining the scores from all four primary index scales: Verbal Comprehension, Perceptual Reasoning, Working Memory, and Processing Speed.
The WAIS-IV includes four primary index scores: Verbal Comprehension (VCI), Perceptual Reasoning (PRI), Working Memory (WMI), and Processing Speed (PSI). Fluid Reasoning is measured in other tests but is not a core index in the WAIS.
The Block Design subtest requires participants to recreate patterns using colored blocks, assessing spatial processing, visual-motor coordination, and problem-solving abilities.
The Digit Span subtest, part of the Working Memory Index, evaluates attention and memory by asking participants to recall sequences of numbers in forward, backward, or ascending order.
The Processing Speed Index assesses how quickly and accurately individuals can complete simple tasks, such as matching symbols or scanning for visual information, reflecting cognitive processing efficiency.
