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Fig. 9. Error angles. (A) The remaining angle β (in degrees) between the
actual turning angle and the extended line between the owl's flight path and
the center of the in-flight target speaker was measured, as shown in
Fig. 2J. The error angle did
not depend on the in-flight stimulus delay. Plotted is the mean ± s.d.
Due to technical limitations, only in-flight stimulus delays larger than 700
ms were considered for the analysis, as far as the owl's turn was visible from
above on the video recording. The number of trials, N, is given at
the base of each column. (B) For pooled data from all owls and delays, the
error angles are significantly larger (t-test, P
0.0003)
for the 100 cm distance between speakers than for the 50 cm distance.
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