title: Increased perception of loudness in autism.
abstract: Clinical reports on autism describe abnormal responses to auditory stimuli such as intolerance to sounds. The present study assessed subjective perception of loudness in subjects with autism compared to healthy controls, using two psychoacoustic tests. First, the auditory dynamic range was evaluated at six different tone frequencies. Secondly, loudness growth as a function of the intensity level of a 1 kHz tone was estimated. Verbal responses from a group of 11 children and adolescents with autism were compared to responses of 11 age- and gender- matched healthy controls. Smaller auditory dynamic ranges were found in the autistic group than in the control group, as well as increased perception of loudness, indicating hyperacusis in subjects with autism.
authors.affiliation: Laboratoire 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
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Khalfa
authors.forename: Nicole
authors.initials: N
authors.lastname: Bruneau
authors.forename: Bernadette
authors.initials: B
authors.lastname: Rogé
authors.forename: Nicolas
authors.initials: N
authors.lastname: Georgieff
authors.forename: Evelyne
authors.initials: E
authors.lastname: Veuillet
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Adrien
authors.forename: Catherine
authors.initials: C
authors.lastname: Barthélémy
authors.forename: Lionel
authors.initials: L
authors.lastname: Collet
mesh_terms: D000161:Acoustic Stimulation; D000293:Adolescent; D001301:Audiometry, Pure-Tone; D001321:Autistic Disorder / Q000150:complications* / Q000503:physiopathology*; D016022:Case-Control Studies; D002648:Child; D005260:Female; D006801:Humans; D012001:Hyperacusis / Q000209:etiology*; D008144:Loudness Perception / Q000502:physiology*; D008297:Male; D015203:Reproducibility of Results