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Increased perception of loudness in autism
Stéphanie Khalfa1, Nicole Bruneau, Bernadette Rogé
1Laboratoire de Neurophysiologie et Neuropsychologie, Faculté de médecine Timone, Inserm EMI-U 9926, Université de la Méditerrancée, 27, Bd Jean Moulin 13385, Marseille Cedex 5, France. skhalfa@skhalfa.com
Hearing Research
|December 25, 2004
Summary
Individuals with autism spectrum disorder (ASD) exhibit altered loudness perception and smaller auditory dynamic ranges. This suggests hyperacusis, or heightened sensitivity to sound, is common in autism.
Area of Science:
- Neuroscience
- Audiology
- Developmental Psychology
Background:
- Clinical observations suggest individuals with autism spectrum disorder (ASD) often display unusual reactions to auditory stimuli, including sound intolerance.
- Understanding these auditory processing differences is crucial for improving quality of life and support for individuals with ASD.
Purpose of the Study:
- To quantitatively assess subjective loudness perception in children and adolescents with autism compared to neurotypical controls.
- To investigate auditory dynamic range and loudness growth functions in the context of autism spectrum disorder.
Main Methods:
- Employed two psychoacoustic tests to evaluate auditory perception in 11 children/adolescents with ASD and 11 age/gender-matched healthy controls.
- Assessed auditory dynamic range across six tone frequencies and estimated loudness growth from sound intensity using a 1 kHz tone.
Main Results:
- The group with autism demonstrated significantly smaller auditory dynamic ranges compared to the control group.
- Participants with autism exhibited an increased perception of loudness, consistent with hyperacusis.
Conclusions:
- Findings indicate altered auditory processing, specifically hyperacusis, in individuals with autism spectrum disorder.
- These results highlight the importance of considering auditory sensitivities in the diagnosis and management of autism.