WAIS Processing Speed Index (PSI) 5

Question 1

In WAIS-IV scoring, what happens to the PSI if an examinee completes a supplemental subtest (e.g., Cancellation) but not both core subtests?

Accepted Answer

The PSI cannot be computed without both core subtests completed

Answer

Both core subtests (Coding and Symbol Search) must be completed to derive a valid PSI; Cancellation is supplemental and cannot substitute.

Question 2

Research comparing PSI performance across cultures suggests that which factor MOST accounts for cross-cultural differences?

Accepted Answer

Familiarity with pencil-and-paper timed tasks and test-taking culture

Answer

Exposure to timed paper-based tasks and test-taking familiarity significantly influences PSI performance across cultural groups.

Question 3

Which index on the WAIS-IV is computed WITHOUT including PSI subtests, making it useful when processing speed is confounded?

Accepted Answer

General Ability Index (GAI)

Answer

The General Ability Index is derived from VCI and PRI subtests only, excluding processing speed and working memory.

Question 4

An examinee who scores in the Superior range on VCI and PRI but Low Average on PSI would BEST be described as having:

Accepted Answer

A specific processing speed weakness relative to intact higher-order cognition

Answer

This profile reflects a specific relative weakness in processing speed while higher-order reasoning abilities remain strong.

Question 5

Which medication class is MOST known to artificially improve PSI scores by increasing alertness and motor speed in individuals with ADHD?

Accepted Answer

Stimulant medications (e.g., methylphenidate)

Answer

Stimulant medications can increase arousal and motor speed, potentially elevating PSI performance in individuals with ADHD.

(WAIS) Wechsler Adult Intelligence Scale Practice Test