| 1LABORATORY OF BRAIN & COGNITIVE SCIENCES FOR CONVERGENCE MEDICINE, HALLYM UNIVERSITY COLLEGE OF MEDICINE 2EAR AND INTERACTION CENTER, DOHEUN INSTITUTE FOR DIGITAL INNOVATION IN MEDICINE (D.I.D.I.M.) 3DEPARTMENT OF SPEECH PATHOLOGY AND AUDIOLOGY, GRADUATE SCHOOL, HALLYM UNIVERSITY 4DEPARTMENT OF OTORHINOLARYNGOLOGY-HEAD AND NECK SURGERY, HALLYM UNIVERSITY COLLEGE OF MEDICINE 5DIVISION OF SOFTWARE, HALLYM UNIVERSITY |
¸ñÀû: Virtual reality (VR) could be a suitable alternative for an implementing
sound localization test, as it can create immersive spatial environments
right before the user¡¯s eyes. By utilizing audio stimuli with
appropriate localization cues, VR can effectively simulate real-world
auditory spatial perception. In this study, the results of a sound
localization test were compared between a test developed in VR and one
conducted in an anechoic chamber. ¹æ¹ý:The sound localization test was conducted under four conditions: a sound
field sound localization test (SF), performed in a soundproof room and
three VR-conditions. The three VR conditions included one using
personally recorded stimuli (PR), another using KEMAR-recorded stimuli
(KR), and the last using Unity-generated directional audio (VR audio,
VRA). All sound localization tests were conducted in a setup with seven
speakers placed at 30-degree intervals. A total of 20 normal-hearing
participants (NH) and 14 participants with unilateral hearing loss (UHL)
were recruited for this study. °á°ú:To compare the three types of stimuli used in VR sound localization
tests, each was visualized to analyze interaural time difference (ITD),
interaural level difference (ILD), and spectral power. Compared to the
recorded stimuli (PR, KR), VRA was found to have relatively simplistic
and artificial localization cues. In the NH group, a significant
difference was observed between the SF and VR tests, except under the
low-pass noise PR stimuli (p = 0.067). A strong correlation was found
between the results of the SF and VR tests (r > 0.9, p < 0.001). °á·Ð:The VR-based sound localization test demonstrated its ability to
overcome cost and spatial limitations while providing results comparable
to those of actual SF tests. In particular, the PR condition yielded the
most reliable results, as it preserved rich interaural time differences
(ITD), interaural level differences (ILD), and spectral cues while
reflecting individualized characteristics. Furthermore, when applying
the HEARRING_LOC_ICF scale, it exhibited a high agreement rate (70.58%)
and small, consistent errors (SD: ¡¾0.55), demonstrating its superior
sound localization performance. These findings suggest that the VR-based
sound localization test could serve as a valuable tool for disability
assessment and clinical applications. |