ANOVA and Scheffé post-hoc test for azimuthal head-turn angles.

For the three owls, a two-way ANOVA showed a highly significant (p<0.001) influence of the HRTF set on the azimuthal head-turn angle. A Scheffé post-hoc test whose results (p values) are given for each owl, azimuth and stimulus condition (ind. = individualized, 39n = owl 39 normal, 39c = owl 39 ruffcut) revealed that the difference was due to differences at peripheral stimulus angles (±140°), whereas responses to more central stimulus angles mostly did not differ.