Article1999

Impaired auditory frequency discrimination in dyslexia detected with mismatch evoked potentials

Torsten Baldeweg · Alex J. Richardson · Christine Foale · John H Gruzelier

312 citations0/0 files storedAnnals of Neurology

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Reading and Literacy Development Neurobiology of Language and Bilingualism Neuroscience and Music Perception

Abstract

Deficits in phonological skills appear to be at the heart of reading disability; however, the nature of this impairment is not yet known. The hypothesis that dyslexic subjects are impaired in auditory frequency discrimination was tested by using an attention-independent auditory brain potential, termed mismatch negativity (MMN) while subjects performed a visual distractor task. In separate blocks, MMN responses to graded changes in tone frequency or tone duration were recorded in 10 dyslexic and matched control subjects. MMN potentials to changes in tone frequency but not to changes in tone duration were abnormal in dyslexic subjects. This physiological deficit was corroborated by a similarly specific impairment in discriminating tone frequency, but not tone duration, which was assessed separately. Furthermore, the pitch discrimination and MMN deficit was correlated with the degree of impairment in phonological skills, as reflected in reading errors of regular words and nonwords. It is possible that in dyslexia a persistent sensory deficit in monitoring the frequency of incoming sound may impair the feedback control necessary for the normal development of phonological skills.

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References

1983Categorizing sounds and learning to read—a causal connection 1985Developmental dyslexia: Four consecutive patients with cortical anomalies 1997To see but not to read; the magnocellular theory of dyslexia 1993Varieties of developmental dyslexia 1996Auditory Neurophysiologic Responses and Discrimination Deficits in Children with Learning Problems 1973Developmental aphasia: impaired rate of non-verbal processing as a function of sensory modality 1980Specific Reading Disability: Differences in Contrast Sensitivity as a Function of Spatial Frequency 1994Evidence for aberrant auditory anatomy in developmental dyslexia.

Cited by

2012Basic Auditory Processing Deficits in Dyslexia 2001Plastic neural changes and reading improvement caused by audiovisual training in reading-impaired children 2007Using mismatch negativity to study central auditory processing in developmental language and literacy impairments: Where are we, and where should we be going?2000Disruption of the neural response to rapid acoustic stimuli in dyslexia: Evidence from functional MRI 2006Dyslexia and the failure to form a perceptual anchor

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