HRTF assessment based on the time taken by the listener to localize virtual sounds. From left to right: illustration of a participant during the experiment, average time response (τ) as a function of the HRTF set ([R19, R27, R45, R65, R82, R121]: synthetic HRTF sets reconstructed with increasing accuracy, [I]: individual HRTFs obtained by acoustic measurement, [NI1, NI2, NI3]: HRTF sets taken from other individuals) for 3 participants, objective distance based on ISSD (Inter Subject Spectral difference [98]) between the individual set and the set under assessment (from [148]).