Which brain structure is most critically associated with the formation of new episodic memories and is often compromised in anterograde amnesia?

• A. Hippocampus (medial temporal lobe)
• B. Amygdala
• C. Prefrontal cortex
• D. Cerebellum

Answer: (A)

The main idea here is that forming new episodic memories hinges on the hippocampus, a key structure in the medial temporal lobe. The hippocampus binds the elements of an experience—what happened, where it occurred, and when it happened—into a single, coherent memory trace and guides the consolidation of those traces into long-term storage through interactions with cortical areas. When the hippocampus is damaged, encoding new memories is impeded, leading to anterograde amnesia where recent experiences fail to be stored as lasting memories. The amygdala mainly adds emotional salience to memories, the prefrontal cortex supports planning and retrieval strategies, and the cerebellum is more involved in motor and procedural learning. Because of its central role in encoding and organizing new episodic information, the hippocampus is the best answer.