Differential entrainment of neuroelectric delta oscillations in developmental dyslexia

Soltesz, Fruzsina, Szucs, Denes, Leong, Victoria, White, Sonia, & Goswami, Usha (2013) Differential entrainment of neuroelectric delta oscillations in developmental dyslexia. Plos One, 8(10), e76608.

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Abstract

Oscillatory entrainment to the speech signal is important for language processing, but has not yet been studied in developmental disorders of language. Developmental dyslexia, a difficulty in acquiring efficient reading skills linked to difficulties with phonology (the sound structure of language), has been associated with behavioural entrainment deficits. It has been proposed that the phonological ‘deficit’ that characterises dyslexia across languages is related to impaired auditory entrainment to speech at lower frequencies via neuroelectric oscillations (<10 Hz, ‘temporal sampling theory’). Impaired entrainment to temporal modulations at lower frequencies would affect the recovery of the prosodic and syllabic structure of speech. Here we investigated event-related oscillatory EEG activity and contingent negative variation (CNV) to auditory rhythmic tone streams delivered at frequencies within the delta band (2 Hz, 1.5 Hz), relevant to sampling stressed syllables in speech. Given prior behavioural entrainment findings at these rates, we predicted functionally atypical entrainment of delta oscillations in dyslexia. Participants performed a rhythmic expectancy task, detecting occasional white noise targets interspersed with tones occurring regularly at rates of 2 Hz or 1.5 Hz. Both groups showed significant entrainment of delta oscillations to the rhythmic stimulus stream, however the strength of inter-trial delta phase coherence (ITC, ‘phase locking’) and the CNV were both significantly weaker in dyslexics, suggestive of weaker entrainment and less preparatory brain activity. Both ITC strength and CNV amplitude were significantly related to individual differences in language processing and reading. Additionally, the instantaneous phase of prestimulus delta oscillation predicted behavioural responding (response time) for control participants only.

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ID Code: 64221
Item Type: Journal Article
Refereed: Yes
Additional Information: Funding: This research was financially supported by the ANALOGY project (NEST program, contract 29088) funded by the EC. The funders had no role in study
design, data collection and analysis, decision to publish, or preparation of the manuscript.
DOI: 10.1371/journal.pone.0076608
Divisions: Current > Research Centres > Children & Youth Research Centre
Current > QUT Faculties and Divisions > Faculty of Education
Current > Schools > School of Early Childhood
Copyright Owner: Copyright 2013 Solte´sz et al.
Copyright Statement: This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Deposited On: 12 Nov 2013 04:08
Last Modified: 12 Nov 2013 22:26

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