A model of head direction and landmark coding in complex environments
Fig 7
Testing scenery-based HD encoding at a sensory level with the two-environment scheme.
(A) Sceneries in the first environment (Env. I) are all the same as Fig 2A, yet are rotated by 120° anticlockwise in the second environment (Env. II). Simulations are conducted within 20 minutes, assuming the agent explores each environment for 10 minutes. (B) Global representations of dRSC cells (top) and HD cells (bottom) tested on Env. II. Simulations are conducted via our two-stage model with aLB cells. (C) Global representations of dRSC cells (top) and HD cells (bottom) tested on Env. II. Simulations are conducted via the alternative model, shows an opposite direction of firing field drift from (B). This model does not contain aLB cells but rather a direct visual to dRSC connection (subject to classical Hebbian learning). (D) Simulations over the whole 20-minute learning time via our two-stage model with aLB cells (left) and the alternative model without aLB cells (right), showing opposite directions of HD drift. Abbreviations: HD: head direction; Diff.: difference; dRSC: dysgranular retrosplenial cortex; f: firing rate.