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Late, not early mismatch responses to changes in frequency are reduced or deviant in children with dyslexia: an event-related potential study / L. F. HALLIDAY in Journal of Neurodevelopmental Disorders, 6-1 (December 2014)
[article]
Titre : Late, not early mismatch responses to changes in frequency are reduced or deviant in children with dyslexia: an event-related potential study Type de document : Texte imprimé et/ou numérique Auteurs : L. F. HALLIDAY, Auteur ; Johanna G. BARRY, Auteur ; M. J. HARDIMAN, Auteur ; Dorothy V. M. BISHOP, Auteur Article en page(s) : p.21 Langues : Anglais (eng) Mots-clés : Dyslexia Event-related desynchronization Event-related spectral perturbation Frequency discrimination Inter-trial coherence Ldn Late discriminative negativity Mmn Mismatch negativity Phase locking Index. décimale : PER Périodiques Résumé : BACKGROUND: Developmental disorders of oral and written language have been linked to deficits in the processing of auditory information. However, findings have been inconsistent, both for behavioural and electrophysiological measures. METHODS: In this study, we examined event-related potentials (ERPs) in 20 6- to 14-year-old children with developmental dyslexia and 20 age-matched controls, divided into younger (6-11 years, n = 10) and older (11-14 years, n = 10) age bands. We focused on early (mismatch negativity; MMN) and late (late discriminative negativity; LDN) conventional mismatch responses and associated measures derived from time-frequency analysis (inter-trial coherence and event-related spectral perturbation). Responses were elicited using an auditory oddball task, whereby a stream of 1000-Hz standards was interspersed with rare large (1,200 Hz) and small (1,030 Hz) frequency deviants. RESULTS: Conventional analyses revealed no significant differences between groups in the size of the MMN to either large or small frequency deviants. However, the younger age band of children with dyslexia showed an enhanced inter-trial coherence in the theta frequency band over the time window corresponding to the MMN to small deviants. By contrast, these same children showed a reduced-amplitude LDN for the small deviants relative to their age-matched controls, whilst the older children with dyslexia showed a shorter and less intense period of event-related desynchronization over this time window. CONCLUSIONS: Initial detection and discrimination of auditory frequency change appears normal or even enhanced in children with dyslexia. Rather, deficits in late-stage auditory processing appear to be a feature of this population. En ligne : http://dx.doi.org/10.1186/1866-1955-6-21 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=346
in Journal of Neurodevelopmental Disorders > 6-1 (December 2014) . - p.21[article] Late, not early mismatch responses to changes in frequency are reduced or deviant in children with dyslexia: an event-related potential study [Texte imprimé et/ou numérique] / L. F. HALLIDAY, Auteur ; Johanna G. BARRY, Auteur ; M. J. HARDIMAN, Auteur ; Dorothy V. M. BISHOP, Auteur . - p.21.
Langues : Anglais (eng)
in Journal of Neurodevelopmental Disorders > 6-1 (December 2014) . - p.21
Mots-clés : Dyslexia Event-related desynchronization Event-related spectral perturbation Frequency discrimination Inter-trial coherence Ldn Late discriminative negativity Mmn Mismatch negativity Phase locking Index. décimale : PER Périodiques Résumé : BACKGROUND: Developmental disorders of oral and written language have been linked to deficits in the processing of auditory information. However, findings have been inconsistent, both for behavioural and electrophysiological measures. METHODS: In this study, we examined event-related potentials (ERPs) in 20 6- to 14-year-old children with developmental dyslexia and 20 age-matched controls, divided into younger (6-11 years, n = 10) and older (11-14 years, n = 10) age bands. We focused on early (mismatch negativity; MMN) and late (late discriminative negativity; LDN) conventional mismatch responses and associated measures derived from time-frequency analysis (inter-trial coherence and event-related spectral perturbation). Responses were elicited using an auditory oddball task, whereby a stream of 1000-Hz standards was interspersed with rare large (1,200 Hz) and small (1,030 Hz) frequency deviants. RESULTS: Conventional analyses revealed no significant differences between groups in the size of the MMN to either large or small frequency deviants. However, the younger age band of children with dyslexia showed an enhanced inter-trial coherence in the theta frequency band over the time window corresponding to the MMN to small deviants. By contrast, these same children showed a reduced-amplitude LDN for the small deviants relative to their age-matched controls, whilst the older children with dyslexia showed a shorter and less intense period of event-related desynchronization over this time window. CONCLUSIONS: Initial detection and discrimination of auditory frequency change appears normal or even enhanced in children with dyslexia. Rather, deficits in late-stage auditory processing appear to be a feature of this population. En ligne : http://dx.doi.org/10.1186/1866-1955-6-21 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=346 Neuromagnetic Oscillations Predict Evoked-Response Latency Delays and Core Language Deficits in Autism Spectrum Disorders / J. Christopher EDGAR in Journal of Autism and Developmental Disorders, 45-2 (February 2015)
[article]
Titre : Neuromagnetic Oscillations Predict Evoked-Response Latency Delays and Core Language Deficits in Autism Spectrum Disorders Type de document : Texte imprimé et/ou numérique Auteurs : J. Christopher EDGAR, Auteur ; Sarah Y. KHAN, Auteur ; Lisa BLASKEY, Auteur ; Vivian Y. CHOW, Auteur ; Michael REY, Auteur ; William GAETZ, Auteur ; Katelyn M. CANNON, Auteur ; Justin F. MONROE, Auteur ; Lauren CORNEW, Auteur ; Saba QASMIEH, Auteur ; Song LIU, Auteur ; John P. WELSH, Auteur ; Susan E. LEVY, Auteur ; Timothy P. L. ROBERTS, Auteur Article en page(s) : p.395-405 Langues : Anglais (eng) Mots-clés : Auditory Autism spectrum disorders M100 Gamma Evoked Inter-trial coherence Phase-locking Magnetoencephalography Index. décimale : PER Périodiques Résumé : Previous studies have observed evoked response latency as well as gamma band superior temporal gyrus (STG) auditory abnormalities in individuals with autism spectrum disorders (ASD). A limitation of these studies is that associations between these two abnormalities, as well as the full extent of oscillatory phenomena in ASD in terms of frequency and time, have not been examined. Subjects were presented pure tones at 200, 300, 500, and 1,000 Hz while magnetoencephalography assessed activity in STG auditory areas in a sample of 105 children with ASD and 36 typically developing controls (TD). Findings revealed a profile such that auditory STG processes in ASD were characterized by pre-stimulus abnormalities across multiple frequencies, then early high-frequency abnormalities followed by low-frequency abnormalities. Increased pre-stimulus activity was a ‘core’ abnormality, with pre-stimulus activity predicting post-stimulus neural abnormalities, group membership, and clinical symptoms (CELF-4 Core Language Index). Deficits in synaptic integration in the auditory cortex are associated with oscillatory abnormalities in ASD as well as patient symptoms. Increased pre-stimulus activity in ASD likely demonstrates a fundamental signal-to-noise deficit in individuals with ASD, with elevations in oscillatory activity suggesting an inability to maintain an appropriate ‘neural tone’ and an inability to rapidly return to a resting state prior to the next stimulus. En ligne : http://dx.doi.org/10.1007/s10803-013-1904-x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=258
in Journal of Autism and Developmental Disorders > 45-2 (February 2015) . - p.395-405[article] Neuromagnetic Oscillations Predict Evoked-Response Latency Delays and Core Language Deficits in Autism Spectrum Disorders [Texte imprimé et/ou numérique] / J. Christopher EDGAR, Auteur ; Sarah Y. KHAN, Auteur ; Lisa BLASKEY, Auteur ; Vivian Y. CHOW, Auteur ; Michael REY, Auteur ; William GAETZ, Auteur ; Katelyn M. CANNON, Auteur ; Justin F. MONROE, Auteur ; Lauren CORNEW, Auteur ; Saba QASMIEH, Auteur ; Song LIU, Auteur ; John P. WELSH, Auteur ; Susan E. LEVY, Auteur ; Timothy P. L. ROBERTS, Auteur . - p.395-405.
Langues : Anglais (eng)
in Journal of Autism and Developmental Disorders > 45-2 (February 2015) . - p.395-405
Mots-clés : Auditory Autism spectrum disorders M100 Gamma Evoked Inter-trial coherence Phase-locking Magnetoencephalography Index. décimale : PER Périodiques Résumé : Previous studies have observed evoked response latency as well as gamma band superior temporal gyrus (STG) auditory abnormalities in individuals with autism spectrum disorders (ASD). A limitation of these studies is that associations between these two abnormalities, as well as the full extent of oscillatory phenomena in ASD in terms of frequency and time, have not been examined. Subjects were presented pure tones at 200, 300, 500, and 1,000 Hz while magnetoencephalography assessed activity in STG auditory areas in a sample of 105 children with ASD and 36 typically developing controls (TD). Findings revealed a profile such that auditory STG processes in ASD were characterized by pre-stimulus abnormalities across multiple frequencies, then early high-frequency abnormalities followed by low-frequency abnormalities. Increased pre-stimulus activity was a ‘core’ abnormality, with pre-stimulus activity predicting post-stimulus neural abnormalities, group membership, and clinical symptoms (CELF-4 Core Language Index). Deficits in synaptic integration in the auditory cortex are associated with oscillatory abnormalities in ASD as well as patient symptoms. Increased pre-stimulus activity in ASD likely demonstrates a fundamental signal-to-noise deficit in individuals with ASD, with elevations in oscillatory activity suggesting an inability to maintain an appropriate ‘neural tone’ and an inability to rapidly return to a resting state prior to the next stimulus. En ligne : http://dx.doi.org/10.1007/s10803-013-1904-x Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=258