Fig. 6. Turning angles. (A) The mean turning angles in degrees are plotted against
the stimulus delay. The linear regression (solid line, slope
0.03691±0.00941) shows that the turning angle increases with the
stimulus delay. Both parameters are significantly correlated. The number
(N) of analyzed trials is given below each data point. Angles were
not significantly different between stimulus delays or owls. (B) Turning
angles were significantly (P
0.05) smaller for speaker sequences
with a distance of 50 cm than of 100 cm between the initial and the in-flight
target. The number of trials (N) is given above each column.