Nonverbal reasoning, spatial processing, and visual-motor integration. Block Design, Matrix Reasoning, Visual Puzzles Ability to hold and mentally manipulate information. Digit Span, Arithmetic Processing Speed (PSI) Efficiency and speed of mental and graphomotor processing. Symbol Search, Coding
: Evaluates the ability to temporarily store, transform, and manipulate information, primarily through Digit Span and Arithmetic . Test Wais Iv