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Fig. 6. In closed-loop conditions, flies show a powerful steady-state expansion
avoidance reflex. By adjusting the difference between the right and left wing
stroke amplitude, flies control the azimuth of (A) a random checkerboard
pattern (N=27), (B) a single vertical stripe (N=27) and (C)
the poles of a constantly expanding/contracting pattern of vertical stripes
(N=13). For each experimental treatment, example responses are
plotted in the left column (i), time series averages are plotted in the center
column (ii; indicated in grayscale) and total probability distributions are
plotted in the right column (iii). For the grayscale plots, the white area
indicates that flies maintained the rotating pattern in that particular
position. On average, flies do not show preference for any single element of
the random checkerboard pattern, whereas they tend to fixate the vertical
stripe in front (0°). Flies show even more robust fixation of the poles of
expansion/contraction. There is less variability in the fly's tendency to
stabilize the poles of the expanding pattern in the rear field of view, thus
the pole of contraction is fixed frontally.
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