Figure 6.

Effect of error in speed s and heading ø on simulated grid cell firing, and correction by phase resetting (same trajectory and simulated grid cell as Figure 2Cii). A) No error. B) Error in the estimate of current direction (addition of random variable from Normal distribution N(0, 10°)) and distance traveled (multiplication by 1+δ, where δ is drawn from N(0, 0.1)) for each time step (1/48s). C) Similar error to B, but with phases reset to φ₁ = φ₂ = φ₃ = 0 whenever the animal visits a single location within 78cm cylinder (i.e. within 2cm of arrow: reset 84 times in 10 mins). These firing rate maps are shown with 5cm boxcar smoothing for better comparison with experimental data.