WPPSI - Wechsler Preschool and Primary Scale of Intelligence Index Score Interpretation Questions and Answers — Questions and Answers
Question 1: A 6-year-old child's WPPSI-IV scores show a Verbal Comprehension Index (VCI) of 120 and a Processing Speed Index (PSI) of 85. The Full Scale IQ (FSIQ) is calculated to be 102. Which statement represents the most accurate interpretation of these results?
- The child has a learning disability due to the 35-point difference between the VCI and PSI.
- The General Ability Index (GAI) should be considered as a more interpretable estimate of the child's reasoning abilities. (Correct answer)
- The FSIQ of 102 is the best and most reliable summary of the child's overall cognitive ability.
- The child's true ability is closer to the VCI of 120, and the PSI score should be disregarded as an outlier.
Correct answer: The General Ability Index (GAI) should be considered as a more interpretable estimate of the child's reasoning abilities.
When a large, statistically significant discrepancy exists between index scores, the FSIQ may not be a valid representation of a child's unitary cognitive ability. The General Ability Index (GAI) is an ancillary score that estimates general ability with less reliance on working memory and processing speed. In this case, with a 35-point difference, the GAI would provide a more meaningful summary of the child's verbal and nonverbal reasoning skills, as it is less affected by the lower processing speed score.
Question 2: An examiner is reviewing a child's WPPSI-IV results and wants to evaluate the efficiency with which the child processes cognitive information. Which ancillary index score, derived from the Working Memory and Processing Speed subtests, provides this specific estimate?
- General Ability Index (GAI)
- Nonverbal Index (NVI)
- Cognitive Proficiency Index (CPI) (Correct answer)
- Vocabulary Acquisition Index (VAI)
Correct answer: Cognitive Proficiency Index (CPI)
The Cognitive Proficiency Index (CPI) is a composite score derived from the Working Memory Index (WMI) and Processing Speed Index (PSI). It is designed to estimate how efficiently a child processes cognitive information, which is crucial for tasks involving learning, problem-solving, and higher-order reasoning.
Question 3: When interpreting a 25-point difference between a child's Verbal Comprehension Index (VCI) and Visual Spatial Index (VSI), what piece of information is most critical for determining if this discrepancy is clinically unusual?
- The Full Scale IQ (FSIQ) score.
- The child's performance on the supplemental subtests.
- The standard error of measurement for each index.
- The base rate of this difference in the normative sample. (Correct answer)
Correct answer: The base rate of this difference in the normative sample.
While statistical significance is important, the base rate provides the most crucial context for interpretation. The base rate indicates the frequency (e.g., 2%-5%, <1%) with which a specific score difference occurred in the standardization sample. A statistically significant difference that is very common (high base rate) is interpreted differently than one that is very rare (low base rate), with the latter suggesting a more clinically unusual pattern of strengths and weaknesses.
Question 4: A 5-year-old's WPPSI-IV profile shows a VCI of 115, FRI of 118, WMI of 88, and PSI of 90. This specific pattern, where reasoning abilities are significantly higher than cognitive efficiency, most strongly suggests that the child:
- possesses strong cognitive reasoning abilities that may not be fully apparent in tasks requiring significant mental efficiency. (Correct answer)
- has a primary and significant deficit in nonverbal, fluid reasoning.
- exhibits a globally consistent and unitary cognitive profile across all domains.
- has an underlying language disorder that is depressing all cognitive functions.
Correct answer: possesses strong cognitive reasoning abilities that may not be fully apparent in tasks requiring significant mental efficiency.
This pattern shows a clear discrepancy between the indexes that contribute to the General Ability Index (VCI and FRI are High Average) and those that contribute to the Cognitive Proficiency Index (WMI and PSI are Average/Low Average). This suggests the child's strong higher-order reasoning capabilities might be masked or hampered in situations that place heavy demands on working memory or require rapid processing.
Question 5: A psychologist notes that a child has a significantly lower Visual Spatial Index (VSI) compared to their Verbal Comprehension Index (VCI), which is in the Superior range. This specific pattern indicates a:
- relative weakness in nonverbal reasoning, analysis of visual details, and visual-motor skills. (Correct answer)
- global delay in cognitive development affecting all areas of functioning.
- specific deficit in the ability to process simple information quickly and efficiently.
- strength in understanding part-whole relationships and spatial visualization.
Correct answer: relative weakness in nonverbal reasoning, analysis of visual details, and visual-motor skills.
The VSI measures the ability to evaluate visual details and understand visual spatial relationships to construct geometric designs. When this score is significantly lower than the VCI (which measures verbal reasoning and knowledge), it points to a relative weakness in the visual-spatial domain compared to the child's well-developed verbal abilities. It does not indicate a global delay, a processing speed issue (PSI), or a strength.
Question 6: A 4-year-old child obtains a Working Memory Index (WMI) score of 68, while all other primary index scores are in the Average range (90-109). This isolated and significant deficit is most likely to manifest in the child's difficulty with which of the following real-world tasks?
- Completing a familiar jigsaw puzzle.
- Explaining the rules of a simple game.
- Following multi-step classroom instructions. (Correct answer)
- Quickly pointing to a target picture in a search group.
Correct answer: Following multi-step classroom instructions.
Working memory involves the ability to hold and mentally manipulate information for a short period. A score in the Extremely Low range (below 70) indicates a significant deficit. This would directly impact a child's ability to follow a sequence of instructions (e.g., 'Put your crayons away, get your lunchbox, and line up at the door') because they would struggle to hold all the steps in mind while executing the task.
WPPSI - Wechsler Preschool and Primary Scale of Intelligence Index Score Interpretation Questions and Answers
A 6-year-old child's WPPSI-IV scores show a Verbal Comprehension Index (VCI) of 120 and a Processing Speed Index (PSI) of 85.
The Full Scale IQ (FSIQ) is calculated to be 102.
Which statement represents the most accurate interpretation of these results?