How do we plan our way from A to B? Imagine you are planning your way home from your favorite café. You need to know both the location of the café and your home as well as the direction between them to find the best route. Imagining what you will see when exiting the café allows you to determine whether to turn left or right. Our new paper, published in eLife
, shows that representations of facing direction and grid-cell computations play a role in mental simulation in service of navigational planning.