Research article summary (published 30 Aug 2009):

Speech-perception-in-noise deficits in dyslexia.

Full Abstract

Speech perception deficits in developmental dyslexia were investigated in quiet and various noise conditions. Dyslexics exhibited clear speech perception deficits in noise but not in silence. Place-of-articulation was more affected than voicing or manner-of-articulation. Speech-perception-in-noise deficits persisted when performance of dyslexics was compared to that of much younger children matched on reading age, underscoring the fundamental nature of speech-perception-in-noise deficits. The deficits were not due to poor spectral or temporal resolution because dyslexics exhibited normal 'masking release' effects (i.e. better performance in fluctuating than in stationary noise). Moreover, speech-perception-in-noise predicted significant unique variance in reading even after controlling for low-level auditory, attentional, speech output, short-term memory and phonological awareness processes. Finally, the presence of external noise did not seem to be a necessary condition for speech perception deficits to occur because similar deficits were obtained when speech was degraded by eliminating temporal fine-structure cues without using external noise. In conclusion, the core deficit of dyslexics seems to be a lack of speech robustness in the presence of external or internal noise.

Author information

Author/s: Ziegler, Johannes C (JC); Pech-Georgel, Catherine (C); George, Florence (F); Lorenzi, Christian (C);

Affiliation: Département de Psychologie, Aix-Marseille Université, Marseille, France. Johannes.Ziegler(-atsign-)univ-provence.fr

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Developmental science (Dev Sci), published in England. (Language: eng)

Reference: 2009-Sep; vol 12 (issue 5) : pp 732-45

Dates: Created 2009/08/25; Completed 2009/11/02;

PMID: 19702766, status: MEDLINE (last retrieval date: 11/2/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Acoustic Stimulation - methods Adolescent Attention - physiology Auditory Perceptual Disorders - etiology Child Dyslexia - complications Female Humans Language Tests Male Memory - physiology Neuropsychological Tests

Neuropsychological Tests Noise Perceptual Masking Phonetics Photic Stimulation - methods Psychophysics Reaction Time Reading Sensory Thresholds - physiology Sound Spectrography Speech Perception - physiology Speech Production Measurement

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