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Fig. 1. (A) Time course of head (blue) and body (red) yaw angle exemplifying the
saccadic flight style of blowflies. Positive slopes denote leftward turns,
i.e. turns leading to optic flow into the preferred direction of the right
horizontal system equatorial neuron (HSE). The free-flight data were recorded
in an arena with dimensions of about 40x40x40 cm3, with
images of herbage covering the walls. Arrows are pointing towards instances
where slow, intersaccadic angular head movements were against (left arrow) or
with (right arrow) the direction of previous saccadic turns. (Inset) Sections
of yaw traces, vertically enlarged (scale bar, 20°). (B,C) Average
membrane potential of an HSE-cell in the right brain hemisphere in response to
the optic flow corresponding to (B) head or (C) body movements, the yaw
component of which is shown in A (N=9 responses each). Broken lines
denote resting potential; responses are shifted backwards in time to account
for response latencies and low-pass filtered with a Gaussian, standard
deviation of 3 ms. Upward and downward deflections of the yaw angle in A
correspond to optic flow in the preferred and null direction of the analysed
neurons, respectively.
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