MoCA Abstract Thinking 3 — Questions and Answers
Question 1: Which brain region is MOST strongly linked to impaired performance on MoCA abstraction tasks?
- Hippocampus
- Primary visual cortex
- Prefrontal cortex (Correct answer)
- Cerebellum
Correct answer: Prefrontal cortex
The prefrontal cortex is critical for categorical reasoning and abstract thought; damage here often impairs MoCA abstraction scores.
Question 2: A clinician is explaining MoCA abstraction to a caregiver. Which description is MOST accurate?
- The patient names objects shown on cards
- The patient explains how two objects are similar in category (Correct answer)
- The patient recalls a list of words
- The patient draws a clock
Correct answer: The patient explains how two objects are similar in category
The abstraction subtest asks the patient to identify a categorical similarity between two presented word pairs.
Question 3: A patient scores 0 on both abstraction pairs. Which condition is LEAST likely to explain this finding?
- Mild cognitive impairment
- Frontotemporal dementia
- Alzheimer's disease
- Isolated peripheral neuropathy (Correct answer)
Correct answer: Isolated peripheral neuropathy
Peripheral neuropathy affects the peripheral nervous system and would not impair cortical abstract reasoning as measured by the MoCA.
Question 4: Why does the MoCA include an abstraction subtest rather than relying solely on memory tests?
- To assess hearing acuity
- To detect executive dysfunction not captured by memory tasks alone (Correct answer)
- To measure reading comprehension
- To evaluate motor speed
Correct answer: To detect executive dysfunction not captured by memory tasks alone
Executive functions, including abstraction, can be impaired even when memory is relatively preserved, so the MoCA includes it for broader cognitive screening.
Question 5: A patient says 'a watch and ruler — one is round, one is straight.' This is scored as:
- 1 point
- 2 points
- 0 points (Correct answer)
- Not applicable
Correct answer: 0 points
Describing physical differences rather than a shared category earns 0 points on the MoCA abstraction item.
Question 6: Which of the following responses to 'how are an orange and banana alike?' would earn FULL credit on MoCA?
- They are in the kitchen
- They are both round
- They are both fruit (Correct answer)
- They both have peels
Correct answer: They are both fruit
Naming the superordinate category 'fruit' is the correct abstract response that earns 1 point.
Question 7: The MoCA abstraction subtest is most analogous to which classic neuropsychological concept?
- Digit span forward
- Conceptual categorization / similarities subtest (Correct answer)
- Trail Making Test Part A
- Boston Naming Test
Correct answer: Conceptual categorization / similarities subtest
The MoCA abstraction task mirrors the Similarities subtest used in Wechsler intelligence scales, assessing conceptual categorization.
MoCA Abstract Thinking 3
Which brain region is MOST strongly linked to impaired performance on MoCA abstraction tasks?