Three-dimensional Perception of Sounds in Military With Acoustic Trauma

Recruiting

Brief Summary: Spatial hearing capacities of soldiers with acoustic trauma are evaluated in ENT consultations with routine tests (i.e. tonal audiometry, voice audiometry). While the results conclude that soldiers with acoustic trauma have sufficient abilities to carry out professional missions, soldiers report recurring complaints of sound localization (spatial hearing), i.e. difficulties in identifying the position of sound sources in their environment. However, there is currently no objective test to identify and objectify these complaints of spatial hearing.

The investigators have developed a new approach (SPHERE) based on virtual reality and 3D motion tracking, allowing us to evaluate and record the spatial hearing performance of subject with hearing deficit. This system allowed us to highlight localization deficits in three-dimensional space.

This project explores and quantifies the spatial hearing impairments of soldiers with acoustic trauma. The quantification of the spatial hearing capacities will allow to define a specific rehabilitation strategy of spatial hearing deficits.

Recruitment & Eligibility

Inclusion Criteria

acoustic traumatized military group :

Age between 18 and 65 inclusive
Active or reserve military personnel
Diagnosis of noise trauma for at least one month
Regularly followed up in the ENT department of the Desgenettes Army Training Hospital in Lyon or in the medical offices of the Army Medical Centers.
Able to understand the experimental instructions
Affiliated to a social security scheme
Having been informed of the study and having given their agreement to participate normal hearing group :
Age between 18 and 65 years inclusive
Able to understand the experimental instructions
Affiliated to a social security scheme
Having been informed of the study and given their agreement to participate

Exclusion Criteria

Primary Outcome Measures

Name	Time	Method
Cumulative error value "3d-D" measuring the spatial hearing performances	at Day 1 during the inclusion visit. The test last 30 minutes.	First, the pointing error will be computed for azimuth, elevation, and depth, in terms of constant error and variable error. Then, these separate dimension errors will be combined into a cumulative error "3d-D", taking into account absolute and variable error in one measure. 3d-D value corresponding to the spatial hearing deficit matching the distance between the 3D hand pointing position and the 3D sound source position. The 3dD performance of the Acoustic traumatised military group will be compared to that of the normal hearing group.

Secondary Outcome Measures

Name	Time	Method
Correlation between the score obtained in the SSQ and the 3dD auditory spatialization performance.	at Day 1 during the inclusion visit.	The behavioral (dependent) variables from the SSQ of the acoustic traumatized military will be analyzed using the linear regression method to examine the relationship between their 3dD auditory spatialization performance and their SSQ score
Correlation between the score obtained in the Framatrix and the 3dD auditory spatialization performance.	at Day 1 during the inclusion visit.	The speech-in-noise performance (SNR) of the acoustic traumatized military will be analysed using the linear regression method to examine the relationship between their speech-in-noise performance (SNR) and their SSQ score

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