Figure 4 –

Potential interactions between egocentric and HD signals in representing spatial context. A) Top-down schematic views of a recording arena with identical geometries but different visual landmarks, along with the locations of the unweighted centroid c based on all physical cues of the environment and the salience centroid s which is weighted by the salience of each physical cue. Note that s is displaced preferentially toward the location of a white cue card in each context, and to a lesser extent toward the black cue card in context 2. The salience vector $\overrightarrow{CS}$ connects the unweighted centroid to the salience centroid and is unique for each context. B) Left, vector field showing the firing preferences of a center-bearing by center-distance cell; middle, vector field showing the firing preferences of an HD cell with PFD pointing northeast; right, resultant vector field after summing the center-bearing/distance and HD fields. Note that the focal point of the center-bearing/distance field (anchor point; indicated by a red X) has shifted toward the northeast after summing with an HD signal.