VGAT^MB01219 mutant flies, expressing VGAT^Scer\UAS.cFa under the control of Scer\GAL4^VGAT and Scer\GAL80^ts.αTub84B, to allow rescue past the embryonic lethality to the adult stage, exhibit normal ranges in wing beat frequency and amplitude. These flies do not exhibit differences in optomotor control capacity compared to controls.

VGAT^MB01219 mutant flies, expressing VGAT^Scer\UAS.cFa under the control of Scer\GAL4^VGAT and Scer\GAL80^ts.αTub84B, show a reduced ability to fixate a stripe moving against a uniform white background and a diminished capacity for tracking a stripe moving against a counter-rotating wide-field background in which any displacement of the stripe is matched exactly by motion of the background in the opposite direction. General wide-filed optomotor function is intact in these mutants, while the behavioral deficit in these flies is specific for figure detection computations required to follow or fixate the direction of gaze on a small-field object, and more so for the control of response magnitude rather than timing.