But in the other scan, the phone on the right ear was switched on, muted, and set to receive a lengthy recorded message.
The phone on the left ear was turned off, while the one on the right received a 50-minute recorded message.
Scroll through the many recorded messages, listening for the voice we recognised.
They turned it on, and replayed the previously recorded signal from CA1 — like a recorded message from the brain. The rats remembered.
