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Fig. 6. Saccadic flight style of Drosophila flying freely in a
non-rotating random-dot arena. (A–C) Three flight paths of single fruit
flies voluntarily starting from rest (top view). Flight is characterized by
sequences of straight flight interspaced by 130 ms short, approximately
90–180° saccadic turns. Horizontal forward velocity is plotted in
pseudo-colour. Red cross, arena centre. (D) Angular velocity during flight
saccades elicited at various forward velocities in response to optomotor
stimulation. Each data point of a curve represents the averaged value derived
from the mean saccadic velocity of each of the 131 tested fruit flies. The
mean standard deviations over all data points of each curve amount to 546
(black), 425 (red), 347 (green), 263 (blue), 287 (cyan) and 513°
s–1 (purple). (E) Modulation in horizontal velocity during
flight saccades. The standard deviations averaged over all data points of a
curve amount to 0.12 (black), 0.12 (red), 0.15 (green), 0.10 (blue), 0.13
(cyan) and 0.17 m s–1 (purple). (F) Frequency of saccades
slightly increases with increasing horizontal velocity estimated from flight
sequences between saccades (intersaccade velocity). The black line represents
the linear regression fit on the data set (y=1.31x+2.55,
R2=0.04, N=131 saccades, P=0.024).
Colour coding in D–F: 0° s–1,
0.26±0.08 m s–1, 22 (black); 100°
s–1, 0.27±0.08 m s–1, 23 (red);
300° s–1, 0.33±0.07 m s–1, 20
(green); 500° s–1, 0.45±0.06 m
s–1, 20 (blue); 700° s–1,
0.49±0.09 m s–1, 21 (cyan); and 900°
s–1, 0.45±0.09 m s–1, 26 (purple);
for arena velocity, mean forward flight velocity and number of flies,
respectively.
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