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Dyslexia erp

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https://www.readbyqxmd.com/read/27739608/neural-initialization-of-audiovisual-integration-in-prereaders-at-varying-risk-for-developmental-dyslexia
#1
Iliana I Karipidis, Georgette Pleisch, Martina Röthlisberger, Christoph Hofstetter, Dario Dornbierer, Philipp Stämpfli, Silvia Brem
Learning letter-speech sound correspondences is a major step in reading acquisition and is severely impaired in children with dyslexia. Up to now, it remains largely unknown how quickly neural networks adopt specific functions during audiovisual integration of linguistic information when prereading children learn letter-speech sound correspondences. Here, we simulated the process of learning letter-speech sound correspondences in 20 prereading children (6.13-7.17 years) at varying risk for dyslexia by training artificial letter-speech sound correspondences within a single experimental session...
October 14, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27496263/are-the-literacy-difficulties-that-characterize-developmental-dyslexia-associated-with-a-failure-to-integrate-letters-and-speech-sounds
#2
Hannah M Nash, Debbie Gooch, Charles Hulme, Yatin Mahajan, Genevieve McArthur, Kurt Steinmetzger, Margaret J Snowling
The 'automatic letter-sound integration hypothesis' (Blomert, ) proposes that dyslexia results from a failure to fully integrate letters and speech sounds into automated audio-visual objects. We tested this hypothesis in a sample of English-speaking children with dyslexic difficulties (N = 13) and samples of chronological-age-matched (CA; N = 17) and reading-age-matched controls (RA; N = 17) aged 7-13 years. Each child took part in two priming experiments in which speech sounds were preceded by congruent visual letters (congruent condition) or Greek letters (baseline)...
August 6, 2016: Developmental Science
https://www.readbyqxmd.com/read/27422537/visual-naming-deficits-in-dyslexia-an-erp-investigation-of-different-processing-domains
#3
Susana Araújo, Luís Faísca, Alexandra Reis, J Frederico Marques, Karl Magnus Petersson
Naming speed deficits are well documented in developmental dyslexia, expressed by slower naming times and more errors in response to familiar items. Here we used event-related potentials (ERPs) to examine at what processing level the deficits in dyslexia emerge during a discrete-naming task. Dyslexic and skilled adult control readers performed a primed object-naming task, in which the relationship between the prime and the target was manipulated along perceptual, semantic and phonological dimensions. A 3×2 design that crossed Relationship Type (Visual, Phonemic Onset, and Semantic) with Relatedness (Related and Unrelated) was used...
July 12, 2016: Neuropsychologia
https://www.readbyqxmd.com/read/27131343/auditory-evoked-potentials-to-speech-and-nonspeech-stimuli-are-associated-with-verbal-skills-in-preschoolers
#4
Soila Kuuluvainen, Alina Leminen, Teija Kujala
Children's obligatory auditory event-related potentials (ERPs) to speech and nonspeech sounds have been shown to associate with reading performance in children at risk or with dyslexia and their controls. However, very little is known of the cognitive processes these responses reflect. To investigate this question, we recorded ERPs to semisynthetic syllables and their acoustically matched nonspeech counterparts in 63 typically developed preschoolers, and assessed their verbal skills with an extensive set of neurocognitive tests...
June 2016: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/26973493/erps-reveal-the-time-course-of-aberrant-visual-phonological-binding-in-developmental-dyslexia
#5
Manon W Jones, Jan-Rouke Kuipers, Guillaume Thierry
New evidence is accumulating for a deficit in binding visual-orthographic information with the corresponding phonological code in developmental dyslexia. Here, we identify the mechanisms underpinning this deficit using event-related brain potentials (ERPs) in dyslexic and control adult readers performing a letter-matching task. In each trial, a printed letter was presented synchronously with an auditory letter name. Incongruent (mismatched), frequent trials were interleaved with congruent (matched) infrequent target pairs, which participants were asked to report by pressing a button...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/26971481/letter-sound-processing-deficits-in-children-with-developmental-dyslexia-an-erp-study
#6
Kristina Moll, Sandra Hasko, Katharina Groth, Jürgen Bartling, Gerd Schulte-Körne
OBJECTIVE: The time course during letter-sound processing was investigated in children with developmental dyslexia (DD) and typically developing (TD) children using electroencephalography. METHOD: Thirty-eight children with DD and 25 TD children participated in a visual-auditory oddball paradigm. Event-related potentials (ERPs) elicited by standard and deviant stimuli in an early (100-190 ms) and late (560-750 ms) time window were analysed. RESULTS: In the early time window, ERPs elicited by the deviant stimulus were delayed and less left lateralized over fronto-temporal electrodes for children with DD compared to TD children...
April 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/26792038/event-related-potential-patterns-reflect-reversed-hemispheric-activity-during-visual-attention-processing-in-children-with-dyslexia-a-preliminary-study
#7
Joong-Gu Kang, Seung-Hwan Lee, Eun-Jin Park, Hyun-Sung Leem
OBJECTIVE: Individuals with dyslexia experience reading difficulties, whereas their other cognitive abilities seem normal. The purpose of this study was to investigate the event-related potential (ERP) patterns of children with dyslexia during a target-detection task. METHODS: Seventeen children with dyslexia and 18 children without this disorder participated in this study. We evaluated their writing and reading ability, symptoms of attention-deficit/hyperactivity disorder, and intelligence quotient...
February 29, 2016: Clinical Psychopharmacology and Neuroscience: the Official Scientific Journal of the Korean College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/26639313/print-tuning-lateralization-and-handedness-an-event-related-potential-study-in-dyslexic-higher-education-students
#8
Ellie R H van Setten, Silvia Martinez-Ferreiro, Natasha M Maurits, Ben A M Maassen
Despite their ample reading experience, higher education students with dyslexia still show deficits in reading and reading-related skills. Lateralized print tuning, the early sensitivity to print of the left parietal cortex signalled by the N1 event-related potential (ERP) component, differs between beginning dyslexic readers and controls. For adults, the findings are mixed. The present study aims to investigate whether print tuning, as indexed by the N1 component, differs between 24 students with dyslexia and 15 non-dyslexic controls...
February 2016: Dyslexia: the Journal of the British Dyslexia Association
https://www.readbyqxmd.com/read/26562794/spatial-attention-and-reading-ability-erp-correlates-of-flanker-and-cue-size-effects-in-good-and-poor-adult-phonological-decoders
#9
Allison Jane Matthews, Frances Heritage Martin
To investigate facilitatory and inhibitory processes during selective attention among adults with good (n=17) and poor (n=14) phonological decoding skills, a go/nogo flanker task was completed while EEG was recorded. Participants responded to a middle target letter flanked by compatible or incompatible flankers. The target was surrounded by a small or large circular cue which was presented simultaneously or 500ms prior. Poor decoders showed a greater RT cost for incompatible stimuli preceded by large cues and less RT benefit for compatible stimuli...
December 2015: Brain and Language
https://www.readbyqxmd.com/read/26489969/facial-speech-gestures-the-relation-between-visual-speech-processing-phonological-awareness-and-developmental-dyslexia-in-10-year-olds
#10
Gesa Schaadt, Claudia Männel, Elke van der Meer, Ann Pannekamp, Angela D Friederici
Successful communication in everyday life crucially involves the processing of auditory and visual components of speech. Viewing our interlocutor and processing visual components of speech facilitates speech processing by triggering auditory processing. Auditory phoneme processing, analyzed by event-related brain potentials (ERP), has been shown to be associated with impairments in reading and spelling (i.e. developmental dyslexia), but visual aspects of phoneme processing have not been investigated in individuals with such deficits...
October 21, 2015: Developmental Science
https://www.readbyqxmd.com/read/26338323/a-computational-model-of-implicit-memory-captures-dyslexics-perceptual-deficits
#11
Sagi Jaffe-Dax, Ofri Raviv, Nori Jacoby, Yonatan Loewenstein, Merav Ahissar
UNLABELLED: Dyslexics are diagnosed for their poor reading skills, yet they characteristically also suffer from poor verbal memory and often from poor auditory skills. To date, this combined profile has been accounted for in broad cognitive terms. Here we hypothesize that the perceptual deficits associated with dyslexia can be understood computationally as a deficit in integrating prior information with noisy observations. To test this hypothesis we analyzed the performance of human participants in an auditory discrimination task using a two-parameter computational model...
September 2, 2015: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/26285096/developmental-dyslexia-with-and-without-language-impairment-erps-reveal-qualitative-differences-in-morphosyntactic-processing
#12
Chiara Cantiani, Maria Luisa Lorusso, Paolo Perego, Massimo Molteni, Maria Teresa Guasti
This study aimed to characterize neuropsychological and linguistic skills in children with Developmental Dyslexia (DD) with and without Language Impairment (LI). Behavioral tests of short-term memory, phonemic awareness, and morphosyntactic processing and electrophysiological responses to agreement violations were administered to 32 DD children (16 with additional LI) and 16 controls. Behavioral data revealed quantitative differences among groups: DD+LI children showed the worst performance, followed by DD-only children and controls...
2015: Developmental Neuropsychology
https://www.readbyqxmd.com/read/26157382/crossmodal-deficit-in-dyslexic-children-practice-affects-the-neural-timing-of-letter-speech-sound-integration
#13
Gojko Žarić, Gorka Fraga González, Jurgen Tijms, Maurits W van der Molen, Leo Blomert, Milene Bonte
A failure to build solid letter-speech sound associations may contribute to reading impairments in developmental dyslexia. Whether this reduced neural integration of letters and speech sounds changes over time within individual children and how this relates to behavioral gains in reading skills remains unknown. In this research, we examined changes in event-related potential (ERP) measures of letter-speech sound integration over a 6-month period during which 9-year-old dyslexic readers (n = 17) followed a training in letter-speech sound coupling next to their regular reading curriculum...
2015: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/25957504/individual-differences-in-involvement-of-the-visual-object-recognition-system-during-visual-word-recognition
#14
Sarah Laszlo, Elizabeth Sacchi
Individuals with dyslexia often evince reduced activation during reading in left hemisphere (LH) language regions. This can be observed along with increased activation in the right hemisphere (RH), especially in areas associated with object recognition - a pattern referred to as RH compensation. The mechanisms of RH compensation are relatively unclear. We hypothesize that RH compensation occurs when the RH object recognition system is called upon to supplement an underperforming LH visual word form recognition system...
June 2015: Brain and Language
https://www.readbyqxmd.com/read/25534719/audiovisual-perception-of-natural-speech-is-impaired-in-adult-dyslexics-an-erp-study
#15
J Rüsseler, I Gerth, M Heldmann, T F Münte
The present study used event-related brain potentials (ERPs) to investigate audiovisual integration processes in the perception of natural speech in a group of German adult developmental dyslexic readers. Twelve dyslexic and twelve non-dyslexic adults viewed short videos of a male German speaker. Disyllabic German nouns served as stimulus material. The auditory and the visual stimulus streams were segregated to create four conditions: in the congruent condition, the spoken word and the auditory word were identical...
February 26, 2015: Neuroscience
https://www.readbyqxmd.com/read/25528285/lexical-and-sublexical-orthographic-processing-an-erp-study-with-skilled-and-dyslexic-adult-readers
#16
Susana Araújo, Luís Faísca, Inês Bramão, Alexandra Reis, Karl Magnus Petersson
This ERP study investigated the cognitive nature of the P1-N1 components during orthographic processing. We used an implicit reading task with various types of stimuli involving different amounts of sublexical or lexical orthographic processing (words, pseudohomophones, pseudowords, nonwords, and symbols), and tested average and dyslexic readers. An orthographic regularity effect (pseudowords-nonwords contrast) was observed in the average but not in the dyslexic group. This suggests an early sensitivity to the dependencies among letters in word-forms that reflect orthographic structure, while the dyslexic brain apparently fails to be appropriately sensitive to these complex features...
February 2015: Brain and Language
https://www.readbyqxmd.com/read/25329388/reduced-neural-integration-of-letters-and-speech-sounds-in-dyslexic-children-scales-with-individual-differences-in-reading-fluency
#17
Gojko Žarić, Gorka Fraga González, Jurgen Tijms, Maurits W van der Molen, Leo Blomert, Milene Bonte
The acquisition of letter-speech sound associations is one of the basic requirements for fluent reading acquisition and its failure may contribute to reading difficulties in developmental dyslexia. Here we investigated event-related potential (ERP) measures of letter-speech sound integration in 9-year-old typical and dyslexic readers and specifically test their relation to individual differences in reading fluency. We employed an audiovisual oddball paradigm in typical readers (n = 20), dysfluent (n = 18) and severely dysfluent (n = 18) dyslexic children...
2014: PloS One
https://www.readbyqxmd.com/read/25312203/enhancement-of-brain-event-related-potentials-to-speech-sounds-is-associated-with-compensated-reading-skills-in-dyslexic-children-with-familial-risk-for-dyslexia
#18
Kaisa Lohvansuu, Jarmo A Hämäläinen, Annika Tanskanen, Leena Ervast, Elisa Heikkinen, Heikki Lyytinen, Paavo H T Leppänen
Specific reading disability, dyslexia, is a prevalent and heritable disorder impairing reading acquisition characterized by a phonological deficit. However, the underlying mechanism of how the impaired phonological processing mediates resulting dyslexia or reading disabilities remains still unclear. Using ERPs we studied speech sound processing of 30 dyslexic children with familial risk for dyslexia, 51 typically reading children with familial risk for dyslexia, and 58 typically reading control children. We found enhanced brain responses to shortening of a phonemic length in pseudo-words (/at:a/ vs...
December 2014: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/25243992/basic-auditory-processing-is-related-to-familial-risk-not-to-reading-fluency-an-erp-study
#19
Britt Hakvoort, Aryan van der Leij, Natasha Maurits, Ben Maassen, Titia L van Zuijen
Less proficient basic auditory processing has been previously connected to dyslexia. However, it is unclear whether a low proficiency level is a correlate of having a familial risk for reading problems, or whether it causes dyslexia. In this study, children's processing of amplitude rise time (ART), intensity and frequency differences was measured with event-related potentials (ERPs). ERP components of interest are components reflective of auditory change detection; the mismatch negativity (MMN) and late discriminative negativity (LDN)...
February 2015: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/25110526/late-not-early-mismatch-responses-to-changes-in-frequency-are-reduced-or-deviant-in-children-with-dyslexia-an-event-related-potential-study
#20
Lorna F Halliday, Johanna G Barry, Mervyn J Hardiman, Dorothy Vm Bishop
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...
2014: Journal of Neurodevelopmental Disorders
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