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The 2 × 2 experiment design. Tests of the minimum audible angle were conducted in four conditions: (1) listeners were asked to remain static and the signal was not moved, (2) listeners were asked to turn their heads and the signal moved with them, (3) listeners were asked to remain static and the signals were moved, and (4) listeners were asked to turn their heads and the signal was adjusted so as to appear to remain still with respect to the world.
