Table 4

Mean duration of the HRTF selection sequence reported in each experiment. HRTF selection duration as reported in similar studies have been added for reference. Methods marked provide a full ranking of an HRTF set (e.g. trajectory method), the remainder are designed for the selection of a unique best-match HRTF (e.g. active method). Indicated durations have been divided by the number of task repetitions compared to total reported duration in each experiment (e.g. 3 in exp-zagala) for accurate comparison.

Experiment	Method	HRTFs	Duration
Exp-Parseihian	Trajectory method	7	Not reported
Exp-stitt	Trajectory method	7	Not reported
Exp-zagala	Trajectory method	8	9.0 min
Exp-zagala	Localization method	8	8.2 min
Exp-current	Active method	7	4.7 min
Andreopoulou and Katz [63]	Trajectory method	24	26.0 min
Andreopoulou and Katz [17]	Trajectory method	7	6.5 min
Iwaya [16]	Tournament method	32	15.0 min