Damage to the dorso-lateral pre-frontal cortex can manifest as perseverative errors. Which of these tests best measures perseverative errors?

Question

BlackTom AI · Accepted Answer

The Wisconsin Card Sort Test (WCST) directly measures perseverative errors by requiring subjects to infer and then shift sorting rules; persistent use of an old rule despite feedback is scored as a perseverative error.

1) Relevant knowledge points and concepts
- Dorsolateral prefrontal cortex (DLPFC): critical for cognitive flexibility, set‑shifting, and executive control. Lesions here produce perseveration — repeating a response or rule despite feedback that it is no longer appropriate.
- Perseverative error: continuing to apply a previously correct rule after the rule has changed and feedback indicates it is wrong.
- WCST: standardized neuropsychological test designed to assess abstract reasoning, set‑shifting, and the tendency to perseverate.

2) Step‑by‑step reasoning
- On the WCST, the examiner presents stimulus cards that vary by color, shape, and number. The examinee must sort cards according to an implicit rule (e.g., color), inferred from examiner feedback (“right” or “wrong”).
- After a series of correct responses, the sorting rule is changed without warning (e.g., from color to shape). Successful performance requires detecting the feedback pattern and shifting to the new sorting rule.
- A perseverative error occurs if the examinee continues to sort according to the old rule despite receiving negative feedback after the rule change.

3) Scoring/measurement (intermediate steps)
- Each card sorted after a rule shift is evaluated: if the chosen card matches the previous rule rather than the new rule, it is counted as a perseverative response/error.
- The WCST yields a number of perseverative errors and percent perseverative responses, providing a direct metric of perseveration.

4) Why this is correct
- The WCST was specifically designed to elicit and quantify perseverative behavior linked to DLPFC dysfunction. Its rule‑shift design and explicit scoring for perseveration make it the best test for this construct.

5) Why other tests are less appropriate
- Stroop Test measures inhibitory control and interference, not perseverative rule‑shifting per se.
- Trail Making Test assesses processing speed and cognitive flexibility but does not yield a direct perseverative error count.
- Verbal fluency tasks can show reduced flexibility but do not systematically quantify perseverative errors the way the WCST does.

Conclusion: Because it measures set‑shifting and explicitly counts perseverative errors following unannounced rule changes, the Wisconsin Card Sort Test is the best test for measuring perseverative errors. This matches the provided answer: Wisconsin Card Sort.

Damage to the dorso-lateral pre-frontal cortex can manifest as perseverative errors. Which of these tests best measures perseverative errors?单项选择题

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