Neural encoding of the speech envelope by children with developmental dyslexia

Power, Alan J.; Colling, Lincoln; Mead, Natasha; Barnes, Lisa L.; Goswami, Usha

doi:10.1016/j.bandl.2016.06.006

Cited by 161 publications

(201 citation statements)

References 67 publications

(101 reference statements)

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“…Our data are suggestive of functionally-atypical right-lateralised processing of slower temporal modulations in children with developmental dyslexia. Although the stimuli in the current study were non-speech, we were able to measure neural encoding of speech in the same sample of children in a later study, using semantically unpredictable noise-vocoded sentences (Power et al, 2016). Power et al (2016) utilised a reverse engineering approach, in which the speech envelopes of the sentences were estimated from the neural (EEG) response (via envelope reconstruction, a form of speech resynthesis, see O'Sullivan et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Atypical right hemisphere response to slow temporal modulations in children with developmental dyslexia

et al. 2016

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Phase entrainment of neuronal oscillations is thought to play a central role in encoding speech. Children with developmental dyslexia show impaired phonological processing of speech, proposed theoretically to be related to atypical phase entrainment to slower temporal modulations in speech (< 10 Hz). While studies of children with dyslexia have found atypical phase entrainment in the delta band (~ 2 Hz), some studies of adults with developmental dyslexia have shown impaired entrainment in the low gamma band (~ 35–50 Hz). Meanwhile, studies of neurotypical adults suggest asymmetric temporal sensitivity in auditory cortex, with preferential processing of slower modulations by right auditory cortex, and faster modulations processed bilaterally. Here we compared neural entrainment to slow (2 Hz) versus faster (40 Hz) amplitude-modulated noise using fNIRS to study possible hemispheric asymmetry effects in children with developmental dyslexia. We predicted atypical right hemisphere responding to 2 Hz modulations for the children with dyslexia in comparison to control children, but equivalent responding to 40 Hz modulations in both hemispheres. Analyses of HbO concentration revealed a right-lateralised region focused on the supra-marginal gyrus that was more active in children with dyslexia than in control children for 2 Hz stimulation. We discuss possible links to linguistic prosodic processing, and interpret the data with respect to a neural ‘temporal sampling’ framework for conceptualizing the phonological deficits that characterise children with developmental dyslexia across languages.

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Section: Discussionmentioning

confidence: 99%

Atypical right hemisphere response to slow temporal modulations in children with developmental dyslexia

et al. 2016

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“…Significant differences in hemodynamic activity were also found for the left superior temporal gyrus and the left angular gyrus (areas classically considered to be active during speech processing, see Rauschecker & Scott, 2009). The hemodynamic responses were significantly related to rise time discrimination for this sample of children (these were the same children who had participated in Power et al, 2013Power et al, , 2016.…”

Section: Neural Entrainment To Slower Modulations In Speech and Nonmentioning

confidence: 94%

“…Hence, all the information in the linguistic hierarchy encoded by the listener that is carried by AM information (information about syllables, onset–rimes and phonemes), as well as prosodic linguistic information, would be of poorer quality. Subsequent to Power et al's () rhythmic repetition studies, TS theory has been investigated further in studies using sentences and stories (Molinaro, Lizarazu, Lallier, Bourguignon, & Carreiras, ; Power, Colling, Mead, Barnes, & Goswami, ). There are also relevant studies using the ASSR, described in the next section.…”

Section: Phase Entrainment To Rhythmic Speech In Developmental Dyslexiamentioning

confidence: 99%

A neural oscillations perspective on phonological development and phonological processing in developmental dyslexia

Goswami

2019

Language and Linguist. Compass

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Children's ability to reflect upon and manipulate the sounds in words (“phonological awareness”) develops as part of natural language acquisition, supports reading acquisition, and develops further as reading and spelling are learned. Children with developmental dyslexia typically have impairments in phonological awareness. Many developmental factors contribute to individual differences in phonological development. One important source of individual differences may be the child's sensory/neural processing of the speech signal from an amplitude modulation (~energy or intensity variation) perspective, which may affect the quality of the sensory/neural representations (“phonological representations”) that support phonological awareness. During speech encoding, brain electrical rhythms (oscillations, rhythmic variations in neural excitability) recalibrate their temporal activity to be in time with rhythmic energy variations in the speech signal. The accuracy of this neural alignment or “entrainment” process is related to speech intelligibility. Recent neural studies demonstrate atypical oscillatory function at slower rates in children with developmental dyslexia. Potential relations with the development of phonological awareness by children with dyslexia are discussed.

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“…The children had to repeat what they thought they heard. Power et al . reported that the speech envelopes in the 0–2 Hz (delta) band were encoded significantly less accurately by the brains of the children with dyslexia.…”

Section: Amplitude Rise Time Discrimination and Neural Entrainment Inmentioning

confidence: 99%

Speech rhythm and language acquisition: an amplitude modulation phase hierarchy perspective

Goswami

2019

Annals of the New York Academy of Sciences

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Language lies at the heart of our experience as humans and disorders of language acquisition carry severe developmental costs. Rhythmic processing lies at the heart of language acquisition. Here, I review our understanding of the perceptual and neural mechanisms that support language acquisition, from a novel amplitude modulation perspective. Amplitude modulation patterns in infant‐ and child‐directed speech support the perceptual experience of rhythm, and the brain encodes these rhythm patterns in part via neuroelectric oscillations. When brain rhythms align themselves with (entrain to) acoustic rhythms, speech intelligibility improves. Recent advances in the auditory neuroscience of speech processing enable studies of neuronal oscillatory entrainment in children and infants. The “amplitude modulation phase hierarchy” theoretical perspective on language acquisition is applicable across languages, and cross‐language investigations adopting this novel perspective would be valuable for the field.

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Neural encoding of the speech envelope by children with developmental dyslexia

Cited by 161 publications

References 67 publications

Atypical right hemisphere response to slow temporal modulations in children with developmental dyslexia

Atypical right hemisphere response to slow temporal modulations in children with developmental dyslexia

A neural oscillations perspective on phonological development and phonological processing in developmental dyslexia

Speech rhythm and language acquisition: an amplitude modulation phase hierarchy perspective

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