Hippocampus
A seahorse-shaped brain structure deep in the temporal lobe, crucial for forming new memories and navigating space.
A seahorse-shaped region in the medial temporal lobe of the brain, essential for converting short-term experiences into long-term memories and for spatial navigation. Damage to this structure impairs the ability to form new declarative memories while leaving older memories largely intact.
What this means in real life
When you meet someone new at a party, your hippocampus encodes their face and name so you can remember them next week; without it, you'd forget the encounter entirely despite having just met them.
What it isn’t
It is not the seat of emotion itself—that involves the amygdala and other structures. The hippocampus processes the *memory* of emotional events, not the feeling in the moment.
Commonly misused online
People often conflate it with memory in general, saying 'my hippocampus is bad' when they mean poor recall. In reality, it's specifically involved in forming new episodic memories, not retrieving old ones or storing skills.