A patient presents with a specific neurological deficit following a traumatic brain injury. While they can still experience and express a full range of emotions, including fear and joy, they are unable to form new explicit long-term memories, such as remembering recent conversations or learning new factual information. Which brain structure was most likely damaged?
Show answer and explanation
The answer
Correct answer: B. The hippocampus, which is crucial for the consolidation of new declarative memories.
Tested concept: Hippocampus and amygdala
Explanation
The hippocampus is a key brain structure involved in the formation of new explicit (declarative) long-term memories, including episodic (events) and semantic (facts) memories. Damage to the hippocampus, as seen in cases like Patient H.M., leads to anterograde amnesia, an inability to form new memories, while often leaving emotional processing and older memories intact. The amygdala is primarily involved in processing emotions, particularly fear, and emotional memory, but not the formation of new explicit memories. The cerebellum is involved in motor control and procedural memory, while the hypothalamus regulates basic homeostatic functions.
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