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Fig. 4. (A) Probability density function at the intersaccadic intervals of head yaw
(blue), body yaw (red) and tuned body yaw (green) velocity. (B–D) Power
spectra of sideward (solid) and yaw (broken) angular velocity for body yaw
velocity (B), head yaw velocity (C) and tuned body yaw velocity (D); power
spectral densities were calculated for the intersaccadic intervals using an
algorithm by (Scargle, 1989;
see also Kern et al., 2005b). Sideward is perpendicular to the head's plane of
symmetry. Since the optic flow resulting from translational movements depends
on the distance to environmental objects, sideward velocities of the fly were
converted to angular velocities by multiplying by the nearness (equal to the
inverse of the distance) (Koenderink,
1986) averaged over the trajectories and over the receptive fields
of the neuron (average nearness: 7.14 m–1, corresponding to a
typical distance to the arena wall of 0.14 m). Data based on two flights
originating from different flies. Note that the y-axis in B is scaled
differently from those in C and D.
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