All are the features of Korsakoff’s syndrome except:
**Core Concept**
Korsakoff's syndrome is a neurological disorder characterized by the impaired ability to form new memories, known as anterograde amnesia, and the inability to recall memories formed before the onset of the disease, known as retrograde amnesia. This condition is often associated with chronic alcohol abuse and thiamine deficiency.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of Korsakoff's syndrome, which involves damage to the hippocampus and surrounding structures in the temporal lobe. The hippocampus plays a crucial role in the formation of new memories, and damage to this region leads to anterograde amnesia. Additionally, the damage to the mammillary bodies, a pair of small structures in the diencephalon, contributes to the retrograde amnesia and other cognitive impairments associated with Korsakoff's syndrome.
**Why Each Wrong Option is Incorrect**
**Option A:** Anterograde amnesia is indeed a feature of Korsakoff's syndrome, so this option is incorrect.
**Option B:** Retrograde amnesia is also a characteristic of Korsakoff's syndrome, making this option incorrect as well.
**Option D:** Ataxia, a lack of coordination and balance, is often seen in patients with Korsakoff's syndrome due to the associated thiamine deficiency, which can affect the cerebellum and other parts of the brain.
**Clinical Pearl / High-Yield Fact**
Korsakoff's syndrome is often associated with Wernicke's encephalopathy, a condition that presents with a triad of confusion, ataxia, and ophthalmoplegia. The two conditions are part of a spectrum of disorders caused by thiamine deficiency and are often seen in patients with chronic alcohol abuse.
**Correct Answer: A.**