Fig. 4
Horizontal and vertical anisotropy in grid cell coding. a A cartoon of a virtual animal navigating on horizontal XY plane (top) and the trajectory traversed by the animal (bottom). b, c Raw data (movement trajectories in gray and action potentials in red) and firing rate map of a LAHN place neuron in the model showing localized isotropic representation on the horizontal XY plane. d, e Firing rate and autocorrelation map of a LAHN grid neuron in the model showing hexagonal representations on the horizontal XY plane (HGS > HGSthresh). Hexagonal periodicity is evident from the autocorrelation map and the gridness score (HGS). f A cartoon of a virtual animal navigating on vertical YZ plane (left) and the trajectory traversed by the animal (right). g, h Raw data (movement trajectories in gray and action potentials in red) and firing rate map of the same LAHN place neuron in the model showing stripe-like representations on the vertical YZ plane. i, j Rate map data (movement trajectories in gray) and autocorrelation map of the same LAHN grid neuron in the model showing stripe-like representations on the vertical YZ plane (HGS < HGSthresh). Stripe periodicity is evident from the autocorrelation map
