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Psychiatry · Organic mental disorders: procedural memory
Sample itemAfter bilateral medial temporal lobe resection, a patient cannot remember any event since surgery, yet over several days his speed on a mirror-drawing task steadily improves, although he denies ever having done it. Which memory function is preserved?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
B. Procedural memory
Medial temporal and hippocampal lesions impair the formation of new declarative (episodic and semantic) memories while procedural skill learning, which depends on the basal ganglia and cerebellum, is spared. This was shown in the classic patient H.M.
Option by option
A. Learning new facts
New factual learning is a declarative function and is lost.
B. Procedural memory (correct)
Correct. Skills improve through procedural memory even without conscious recall.
C. Episodic memory for new events
Forming new episodic memories requires the hippocampus and is lost.
D. Recall of conversations from the day before
Recall of recent conversations is episodic and is lost.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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