Three steps a chickadee's hippocampus takes to remember a hidden seed. The bubble above its head is the activity in that brain region.
This is a simplified model based on the public repository for the Fang et al. 2026 paper, "Barcode activity in a recurrent network model of the hippocampus enables efficient memory binding".
As it moves through space, the brain draws a smooth wave of activity that marks where the bird is.
Click a spot to bury a seed. As the bird digs, the smooth wave in its head snaps into a sparse barcode — a unique tag for that site.
Return near a flag: the place cue alone makes the brain complete the whole stored barcode from memory.
Wander, cache, recall — the same circuit, three states.