Calculation of visual cues from body kinematics

The time traces of three putative visual cues were estimated to identify the triggering and visual mediation mechanisms of the rotational maneuvers. The visual cues included the RREV, the relative ceiling fore/aft rotation (ωy), and the relative ceiling lateral rotation (ωx). These visual cues can be perceived by a fly from the image sequence projected on its retina without the direct perceptions of the distance or the body velocities. The time traces of these visual cues during the course of inverted landing can be estimated from the measured body kinematics. More details on the kinematic relationships between the visual cues and the body kinematics are given in the Supplementary Materials.

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