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. Author manuscript; available in PMC: 2024 May 20.
Published in final edited form as: Nature. 2021 Dec 15;601(7891):92–97. doi: 10.1038/s41586-021-04067-0

Extended Data Figure 10 |. A traveling-direction signal computed via optic flow is robust to changes in the yaw angle of the fly’s head.

Extended Data Figure 10 |

a, Fly flying straight with the head aligned to the body axis. EPG and hΔB signals are aligned in the ellipsoid body and fan-shaped body, respectively. b, Fly flying straight forward with the head rotated 20° to the right. The EPG bump––assuming the EPG bump position tracks the fly’s head (rather than body) direction––will rotate 20° counterclockwise. The hΔB bump, however, will remain pointing in the same allocentric traveling direction because the net effect of the EPG bump rotating 20° in one direction and the ego-motion signal from optic flow (not represented in the diagram) rotating 20° in the opposite direction is that the PFR/hΔB bump stably indicates the same traveling direction throughout.