Figure 1.
Schematic illustration of the experimental setup.
Fifteen loudspeakers presented sound stimuli from different azimuthal directions. Loudspeakers are located in front of the subject on a semicircle device of a radius of 0.5 m. With a special knob, the subject turned a laser beam originating from the centre of a semicircle of loudspeakers and confirmed the position of the laser beam pressing the button. In response to the pressed button, the laser beam position was registered by laser detectors in the semicircle of loudspeakers.
Figure 2.
Performances of the subjects in the binaural and monaural conditions.
On the left, the horizontal axis represents the azimuthal positions of loudspeakers, the vertical axis represents the azimuthal response of the subjects. On the right, the mean pre-training responses collapsed across the positions are shown for each group of subjects. The dashed line is the ideal performance curve in this case (e.g., the sound source at 60° corresponds to the response at 60°).
Figure 3.
Improvement after training in total and per side.
Improvement is presented as the difference in error (deviation from the sound source) before and after training. Error bars represent bootstrap bias-corrected and accelerated confidence intervals (p<0.05).
Figure 4.
Improvement after training per side per loudspeaker.
Improvement is presented as the difference in error (deviation from the sound source) before and after training. Error bars represent bootstrap bias-corrected and accelerated confidence intervals (p<0.05).
Figure 5.
Changes of d′ and ß due to training.
Differential values after and before training are presented. Error bars represent bootstrap bias-corrected and accelerated confidence intervals (p<0.05).