Performance
hearing asymmetries, SD
The spatial discrepancy between the stimulated and the reached speaker (i.e., absolute localization error in azimuth, calculated as difference in absolute value between speaker and response position in azimuth in degrees) was on average 24.0 degrees (SD = 14.0), with a numerical (but not-significant) bias toward the side contralateral to the CI (− 2.6°, SD = 7.6; Sound localization performance. We analyzed the influence of hearing asymmetries in hearing thresholds (PTA) between the implanted and non-implanted ear on errors during the Spatial training. We found that the larger the asymmetry (i.e., the higher hearing thresholds in the contralateral ear), the larger the localization error (Performance in the Non-Spatial training was near ceiling for all participants (mean number of errors = 1.5%). During the Non-Spatial training, participants were also faster in completing the trial compared to the Spatial training (Non-Spatial: mean ± SD = 2.5 ± 2.1 s; Spatial training: mean ± SD = 16.1 ± 10.2 s; 