Final answer:
The Processing Speed Index (PSI) is a measure of how quickly a person can complete mental tasks. It is part of the Wechsler Intelligence Scale for Children (WISC) and the Wechsler Adult Intelligence Scale (WAIS). Secondary capacities refer to the specific cognitive abilities that contribute to processing speed.
Step-by-step explanation:
The Processing Speed Index (PSI) is a measure of how quickly a person can complete mental tasks, such as information processing, decision-making, and problem-solving.
It is part of the Wechsler Intelligence Scale for Children (WISC) and the Wechsler Adult Intelligence Scale (WAIS), which are commonly used psychological tests to assess cognitive abilities.
Secondary capacities refer to the specific cognitive abilities that contribute to processing speed, such as visual perception, working memory, and attention.