Brain Areas Involved in Long-Term Memory

Key brain areas for long-term memory (LTM) include the hippocampus, amygdala, neocortex, basal ganglia, and cerebellum.

Hippocampus

• Located in the medial temporal lobe; crucial for forming, encoding, and consolidating new explicit memories (semantic and episodic).

• Not directly involved in implicit memories.

• Essential for Long-Term Potentiation (LTP).

• Transfers memories to the cerebral cortex for long-term storage; does not store LTMs itself.

Case of H.M.

• Removal of hippocampus reduced seizures but caused anterograde amnesia (inability to form new explicit memories).

• Short-term memory (STM) remained functional.

Detailed Summary of Hippocampus Functions

• Temporarily holds memories during consolidation.

• Integrates new information with existing memories.

• Important for spatial memory.

• Active during slow-wave sleep for memory consolidation.

• Transfers explicit memories for permanent storage.

• Links emotions with memory via input from the amygdala.

Amygdala

• Located in the medial temporal lobe; crucial for processing emotional reactions.

• Primarily involved in encoding the emotional component of classically conditioned fear responses and explicit memories.

• Labels memories with distinct emotional responses.

• Emotional arousal at encoding strengthens LTM.

• Noradrenaline increases emotional significance, signaling the hippocampus for encoding and consolidation.

• Attaches emotion to a memory (implicit), while the hippocampus processes facts