Extended Data Fig. 14: Persistent drift biases in darkness after cue rotation, between actual data and model-based simulations.
From: Population dynamics of head-direction neurons during drift and reorientation
a. Recorded examples of drift biases for continuous fast (left group) and slow (right group) cue-rotation. b, c, d and e. Model-simulation of vestibular input recalibration by visual experience. b. Synaptic weight matrix linking the HD layer to the Sensorimotor-by-HD layer (see model in Extended Data Fig. 12), during baseline. c. Simulations of offset during cue-rotation and in subsequent darkness for the fast (3°/s) and slow (1.5°/s; 1.28°/s) cases. Behaviour for individual examples (i.e. head angular velocity) is shared across scenarios and is taken from actual recordings. Sessions without vestibular input recalibration (that is, vestibular angular velocity neurons do not receive input from the bias cells – see model details in Supplementary Information) for both 3°/s and 1.5°/s cases were used as test examples. The 1.28°/s cue-rotation sessions were used to show the effect of cue rotation-speed on drift biases regardless of offset proximity to baseline condition. d. Synaptic weight matrices at the beginning of the 2nd darkness phase for fast (3°/s) and slow (1.5°/s) scenarios showing that baseline associations remain dominant even after 7 min of cue rotation which explains the stabilization around the 0°-offset line. e. Mean drifts (solid lines) in darkness across scenarios. Shaded areas indicate s.e.m.
