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Development of an Audio-based Virtual Gaming Environment to Assist with Navigation Skills in the Blind

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Monaural auditory spatial abilities in early blind individuals.

Sara Finocchietti¹, Davide Esposito¹, Monica Gori¹

¹Unit for Visually Impaired People, Italian Institute of Technology, Genoa, Italy.

|March 2, 2023

Summary

Early blind individuals excel at using spectral cues for sound localization in one ear. This study shows their enhanced monaural auditory bisection skills, unlike sighted individuals.

Keywords:

audio bisection blindness localization monaural space representation

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Area of Science:

Auditory Neuroscience
Human Sensory Perception
Psychoacoustics

Background:

Early blind individuals demonstrate superior sound localization compared to sighted individuals, even with one ear.
However, challenges arise in binaural listening for early blind individuals when discerning distances among multiple sounds.
The monaural auditory bisection task performance in early blind individuals remains unexplored.

Purpose of the Study:

To investigate the auditory spatial perception abilities of early blind individuals under monaural and binaural listening conditions.
To compare the performance of early blind and sighted individuals in sound localization and auditory bisection tasks.
To determine if early blind individuals exhibit enhanced use of spectral cues in monaural auditory spatial tasks.

Main Methods:

Two audio-spatial tasks were administered: a sound localization task and an auditory bisection task.
Participants included eight early blind individuals and eight sighted individuals with temporary blindfolds.
Tasks were performed under both monaural (one ear) and binaural (two ears) listening conditions.

Main Results:

Early blind individuals showed significant improvement in the auditory bisection task under monaural conditions.
No significant difference in performance was observed for the sound localization task between monaural and binaural conditions for early blind individuals.
Sighted participants did not show similar improvements in the monaural auditory bisection task.

Conclusions:

Early blind individuals possess a superior ability to utilize spectral cues for auditory spatial processing in monaural listening.
This enhanced ability is particularly evident in tasks requiring the discrimination of spatial relationships between sounds, such as auditory bisection.
Findings suggest distinct neural adaptations for auditory spatial processing in individuals with early blindness.