A model of head direction and landmark coding in complex environments
Fig 6
dRSC signals stabilize global subcortical HD signals for the simulation in Fig 5.
(A) Simulation in darkness (left, no visual inputs resulting in no feedback from dRSC) shows systematic drift. The HD representation (left, red curves) and its angular difference from actual HD (right, black curves with actual HD subtracted from HD representations) are given over the whole 20-minute learning time. Red dashed lines indicate an ideal error-free HD representation. (B) Simulations of alternating exploration over the multi-environment case in Fig 5A showing stable HD representation (left), as well as global representations of gRSC and HD cells after alternating exploration showing no firing field drift (right). Red dashed lines stand for the center of initial HD firing fields. See the caption of Fig 5 for details. Abbreviations: HD: head-directional/head direction; Accu.: accumulated; Rep.: representation; Diff.: difference; gRSC: granular retrosplenial cortex; f: firing rate.