Grid Cells Spike at Specific Locations (image) Princeton University Caption As the mouse moves around in a square arena (left), a single grid cell in the mouse's brain becomes active, or spikes, when the animal arrives at particular locations in the arena (right). These locations are arranged in a hexagonal pattern. The red dots indicate the mouse's location in the arena when the grid cell fired. Credit Cristina Domnisoru, Princeton University Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.