Changes in the temporal and spectral characteristics of the sound reaching the two ears are known to be of great importance for the perception of spatial sound. The smallest change that can be reliably perceived provides a measure of how accurate directional hearing is. The present study investigates audibility of changes in the temporal characteristics of HRTFs. A listening test is conducted to measure the smallest change in the interaural time difference (ITD) that produces an audible difference of any nature. Results show a large inter-individual variation with a range of audibility thresholds from about 20 µs to more than 300 µs.
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