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. Author manuscript; available in PMC: 2019 Oct 1.
Published in final edited form as: Curr Opin Neurobiol. 2018 Jul 18;52:156–164. doi: 10.1016/j.conb.2018.06.010

Figure 3 |. Similarities between circuit models for the fly and rat heading systems.

Figure 3 |

a, Adapted from Skaggs et al. (1995) [22]. Schematic representing a formal computational model for how the rat head direction signal is built and rotates around a hypothesized ring of head-direction cells. b, Mapping the cell types in the Drosophila protocerebral-bridge/ellipsoid-body circuit onto the model by Skaggs et al. The physiology of E-PGs and P-ENs has been reported whereas the role of the other cell types in this schematic remains speculative (represented by question marks).