Comparison of participants performance during the No HMD condition and the performance plateaus reported in Stitt et al. [20] and Majdak et al. [14]. For the former, reported results are those of participants trained with individual HRTFs. For the later, reported results are those of their experiment 2, aggregating head and hand reporting methods. For both, only the trials after participants reached a performance plateau were considered, i.e. discarding the first 1000 trials. The right-most figure reports absolute polar error values weighted according to the scheme presented in Section 2.3.