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https://www.readbyqxmd.com/read/29588226/the-current-status-of-the-magnocellular-theory-of-developmental-dyslexia
#1
John Stein
Some people doubt that the concept of developmental dyslexia (DD) is useful at all because the phonological weaknesses seen in DD cannot be distinguished from those found in every person with poor reading skills, whatever their cause. Here I argue that true DD is characterized by poor temporal processing, hence impaired visual and auditory sequencing, that is caused by impaired development of transient/magnocellular (M-) systems throughout the brain. These deficits can be measured to distinguish the causes of the phonological weaknesses in DD from those causing similar deficits in other types of poor reading; Importantly this knowledge can be exploited to develop effective improvements in treatment...
March 24, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29577504/the-modality-and-redundancy-effects-in-multimedia-learning-in-children-with-dyslexia
#2
Carolien A N Knoop-van Campen, Eliane Segers, Ludo Verhoeven
The present study aimed to examine the modality and redundancy effects in multimedia learning in children with dyslexia in order to find out whether their learning benefits from written and/or spoken text with pictures. We compared study time and knowledge gain in 26 11-year-old children with dyslexia and 38 typically reading peers in a within-subjects design. All children were presented with a series of user-paced multimedia lessons in 3 conditions: pictorial information presented with (a) written text, (b) audio, or (c) combined text and audio...
March 25, 2018: Dyslexia: the Journal of the British Dyslexia Association
https://www.readbyqxmd.com/read/29488880/shorter-cortical-adaptation-in-dyslexia-is-broadly-distributed-in-the-superior-temporal-lobe-and-includes-the-primary-auditory-cortex
#3
Sagi Jaffe-Dax, Eva Kimel, Merav Ahissar
Studies of performance of individuals with dyslexia on perceptual tasks suggest that their implicit inference of sound statistics is impaired. Previously, using two-tone frequency discrimination, we found that the effect of previous trials' frequencies on judgments of individuals with dyslexia decayed faster than the effect on controls' judgments, and that the adaptation (decrease of neural response to repeated stimuli) of their ERP responses to tones was shorter (Jaffe-Dax et al., 2017). Here, we show the cortical distribution of this abnormal dynamics of adaptation using fast acquisition fMRI...
February 28, 2018: ELife
https://www.readbyqxmd.com/read/29413429/auditory-temporal-perceptual-learning-and-transfer-in-chinese-speaking-children-with-developmental-dyslexia
#4
Manli Zhang, Weiyi Xie, Yanzhi Xu, Xiangzhi Meng
Perceptual learning refers to the improvement of perceptual performance as a function of training. Recent studies found that auditory perceptual learning may improve phonological skills in individuals with developmental dyslexia in alphabetic writing system. However, whether auditory perceptual learning could also benefit the reading skills of those learning the Chinese logographic writing system is, as yet, unknown. The current study aimed to investigate the remediation effect of auditory temporal perceptual learning on Mandarin-speaking school children with developmental dyslexia...
January 29, 2018: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/29401712/what-is-developmental-dyslexia
#5
REVIEW
John Stein
Until the 1950s, developmental dyslexia was defined as a hereditary visual disability, selectively affecting reading without compromising oral or non-verbal reasoning skills. This changed radically after the development of the phonological theory of dyslexia; this not only ruled out any role for visual processing in its aetiology, but it also cast doubt on the use of discrepancy between reading and reasoning skills as a criterion for diagnosing it. Here I argue that this theory is set at too high a cognitive level to be explanatory; we need to understand the pathophysiological visual and auditory mechanisms that cause children's phonological problems...
February 4, 2018: Brain Sciences
https://www.readbyqxmd.com/read/29393703/dichotic-listening-and-sentence-repetition-performance-in-children-with-reading-difficulties
#6
Mária Gósy, Ruth Huntley Bahr, Dorottya Gyarmathy, András Beke
Numerous investigations have identified weaknesses in speech processing and language skills in children with dyslexia; however, little is known about these abilities in children with reading difficulties (RD). The primary objective of this investigation was to determine the utility of auditory speech processing tasks in differentiating children with RD from those with typical reading skills. It was hypothesized that children, who perform below grade level in reading, would also show poorer performance on both dichotic listening and sentence repetition tasks because of the reciprocal influences of deficient auditory speech processing and language abilities...
February 2, 2018: Clinical Linguistics & Phonetics
https://www.readbyqxmd.com/read/29356010/a-life-in-academia-my-career-in-brief
#7
Kenneth Hugdahl
In this article I have summarized some of the main trends and topics of my research career, spanning a time period of 50 years, from its start as a master student at the Department of Psychology, University of Uppsala, Sweden to seeing the end of a long career, now at the University of Bergen, Norway. This journey has, apart from having been a journey across various disciplines and topics in experimental psychology, psychophysiology and neuropsychology, functional neuroimaging and cognitive neuroscience, also been a social class journey for me personally...
February 2018: Scandinavian Journal of Psychology
https://www.readbyqxmd.com/read/29352968/children-with-dyslexia-show-a-reduced-processing-benefit-from-bimodal-speech-information-compared-to-their-typically-developing-peers
#8
Gesa Schaadt, Elke van der Meer, Ann Pannekamp, Regine Oberecker, Claudia Männel
During information processing, individuals benefit from bimodally presented input, as has been demonstrated for speech perception (i.e., printed letters and speech sounds) or the perception of emotional expressions (i.e., facial expression and voice tuning). While typically developing individuals show this bimodal benefit, school children with dyslexia do not. Currently, it is unknown whether the bimodal processing deficit in dyslexia also occurs for visual-auditory speech processing that is independent of reading and spelling acquisition (i...
January 17, 2018: Neuropsychologia
https://www.readbyqxmd.com/read/29321232/hypermyelination-of-the-left-auditory-cortex-in-developmental-dyslexia
#9
Michael A Skeide, Pierre-Louis Bazin, Robert Trampel, Andreas Schäfer, Claudia Männel, Katharina von Kriegstein, Angela D Friederici
OBJECTIVE: Cortical malformations are documented postmortem in speech processing areas of the dyslexic human brain. The goal of this pilot study was to find out if such anatomic anomalies can be detected noninvasively and in vivo. METHODS: We developed a reconstruction of left perisylvian cortex profiles at a resolution of 400 μm using T1 data acquired with ultra-high-field MRI at 7T. Cortical thickness, myelinated cortical thickness, and layer-wise myelination were then compared in 6 men with developmental dyslexia and 6 healthy controls matched for age, sex, handedness, education level, and nonverbal IQ...
February 6, 2018: Neurology
https://www.readbyqxmd.com/read/29304447/dyslexia-as-a-multi-deficit-disorder-working-memory-and-auditory-temporal-processing
#10
Leah Fostick, Hadas Revah
Dyslexia is difficulty in acquiring reading skills despite adequate intelligence and sufficient reading opportunities. Its origin is still under debate. Studies usually focus on a singular cause for dyslexia; however, some researchers argue that dyslexia reflects multiple deficits. Two of the abilities under investigation in dyslexia are working memory (WM) and auditory temporal processing (ATP). In order to better evaluate the relative roles of WM and ATP in dyslexia, in the present study, we tested the contribution of WM and ATP to different types of reading performance and phonological awareness in dyslexia, using a multidimensional approach...
February 2018: Acta Psychologica
https://www.readbyqxmd.com/read/29201552/-atp2c2-and-dyx1c1-are-putative-modulators-of-dyslexia-related-mmr
#11
Bent Müller, Gesa Schaadt, Johannes Boltze, Frank Emmrich, Michael A Skeide, Nicole E Neef, Indra Kraft, Jens Brauer, Angela D Friederici, Holger Kirsten, Arndt Wilcke
Background: Dyslexia is a specific learning disorder affecting reading and spelling abilities. Its prevalence is ~5% in German-speaking individuals. Although the etiology of dyslexia largely remains to be determined, comprehensive evidence supports deficient phonological processing as a major contributing factor. An important prerequisite for phonological processing is auditory discrimination and, thus, essential for acquiring reading and spelling skills. The event-related potential Mismatch Response (MMR) is an indicator for auditory discrimination capabilities with dyslexics showing an altered late component of MMR in response to auditory input...
November 2017: Brain and Behavior
https://www.readbyqxmd.com/read/29163246/screening-protocol-for-early-identification-of-brazilian-children-at-risk-for-dyslexia
#12
Giseli D Germano, Alexandra B P de C César, Simone A Capellini
Early identification of students at risk of dyslexia has been an educational challenge in the past years. This research had two main goals. First, we aimed to develop a screening protocol for early identification of Brazilian children at risk for dyslexia; second, we aimed to identify the predictive variables of this protocol using Principal Component Analysis. The major step involved in developing this protocol was the selection of variables, which were chosen based on the literature review and linguistic criteria...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29107746/how-many-deficits-in-the-same-dyslexic-brains-a-behavioural-and-fmri-assessment-of-comorbidity-in-adult-dyslexics
#13
Laura Danelli, Manuela Berlingeri, Gabriella Bottini, Nunzio A Borghese, Mirko Lucchese, Maurizio Sberna, Cathy J Price, Eraldo Paulesu
Dyslexia can have different manifestations: this has motivated different theories on its nature, on its underlying brain bases and enduring controversies on how to best treat it. The relative weight of the different manifestations has never been evaluated using both behavioural and fMRI measures, a challenge taken here to assess the major systems called into play in dyslexia by different theories. We found that adult well-compensated dyslexics were systematically impaired only in reading and in visuo-phonological tasks, while deficits for other systems (e...
December 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29045729/knockout-mice-for-dyslexia-susceptibility-gene-homologs-kiaa0319-and-kiaa0319l-have-unaffected-neuronal-migration-but-display-abnormal-auditory-processing
#14
Luiz G Guidi, Jane Mattley, Isabel Martinez-Garay, Anthony P Monaco, Jennifer F Linden, Antonio Velayos-Baeza, Zoltán Molnár
Developmental dyslexia is a neurodevelopmental disorder that affects reading ability caused by genetic and non-genetic factors. Amongst the susceptibility genes identified to date, KIAA0319 is a prime candidate. RNA-interference experiments in rats suggested its involvement in cortical migration but we could not confirm these findings in Kiaa0319-mutant mice. Given its homologous gene Kiaa0319L (AU040320) has also been proposed to play a role in neuronal migration, we interrogated whether absence of AU040320 alone or together with KIAA0319 affects migration in the developing brain...
December 1, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29024843/multisensory-integration-and-adhd-like-traits-evidence-for-an-abnormal-temporal-integration-window-in-adhd
#15
Maria Panagiotidi, Paul G Overton, Tom Stafford
Abnormalities in multimodal processing have been found in many developmental disorders such as autism and dyslexia. However, surprisingly little empirical work has been conducted to test the integrity of multisensory integration in Attention Deficit Hyperactivity Disorder (ADHD). The main aim of the present study was to examine links between symptoms of ADHD (as measured using a self-report scale in a healthy adult population) and the temporal aspects of multisensory processing. More specifically, a Simultaneity Judgement (SJ) and a Temporal Order Judgement (TOJ) task were used in participants with low and high levels of ADHD-like traits to measure the temporal integration window and Just-Noticeable Difference (JND) (respectively) between the timing of an auditory beep and a visual pattern presented over a broad range of stimulus onset asynchronies...
October 9, 2017: Acta Psychologica
https://www.readbyqxmd.com/read/28939535/reading-difficulties-and-the-pediatric-ophthalmologist
#16
EDITORIAL
Sheryl M Handler, Walter M Fierson
Approximately 20% of children have dyslexia, a language-based reading disability. A variation in language processing in the brain leads to a deficit in phonological (auditory) processing, which leads to problems in learning to read, write, and spell. Myths continue to exist regarding dyslexia and vision, and although eye and vision problems may coexist with dyslexia, they are not more prevalent than in the general population. Rarely vision problems may make reading at near very difficult and may masquerade as a learning problem or attention deficit disorder/attention deficit hyperactivity disorder...
December 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28938227/do-prereaders-auditory-processing-and-speech-perception-predict-later-literacy
#17
Sophie Vanvooren, Hanne Poelmans, Astrid De Vos, Pol Ghesquière, Jan Wouters
Developmental dyslexia has frequently been linked to deficits in auditory processing and speech perception. However, the presence and precise nature of these deficits and the direction of their relation with reading, remains debated. In this longitudinal study, 87 five-year-olds at high and low family risk for dyslexia were followed before and during different stages of reading acquisition. The processing of different auditory cues was investigated, together with performance on speech perception and phonology and reading...
September 19, 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/28863035/same-or-different-the-overlap-between-children-with-auditory-processing-disorders-and-children-with-other-developmental-disorders-a-systematic-review
#18
Ellen de Wit, Pim van Dijk, Sandra Hanekamp, Margot I Visser-Bochane, Bert Steenbergen, Cees P van der Schans, Margreet R Luinge
OBJECTIVES: Children diagnosed with auditory processing disorders (APD) experience difficulties in auditory functioning and with memory, attention, language, and reading tasks. However, it is not clear whether the behavioral characteristics of these children are distinctive from the behavioral characteristics of children diagnosed with a different developmental disorder, such as specific language impairment (SLI), dyslexia, attention-deficit hyperactivity disorder (ADHD), learning disorder (LD), or autism spectrum disorder...
January 2018: Ear and Hearing
https://www.readbyqxmd.com/read/28834383/visual-motion-and-rapid-auditory-processing-are-solid-endophenotypes-of-developmental-dyslexia
#19
Sara Mascheretti, Simone Gori, Vittoria Trezzi, Milena Ruffino, Andrea Facoetti, Cecilia Marino
Although a genetic component is known to have an important role in the etiology of developmental dyslexia, we are far from understanding the molecular etiopathogenetic pathways. Reduced measures of neurobiological functioning related to reading (dis)ability, i.e., endophenotypes, are promising targets for gene finding and the elucidation of the underlying mechanisms. In a sample of 100 nuclear families with developmental dyslexia (229 offspring) and 83 unrelated typical readers, we tested whether a set of well-established, cognitive phenotypes related to developmental dyslexia (i...
August 17, 2017: Genes, Brain, and Behavior
https://www.readbyqxmd.com/read/28747870/neural-entrainment-and-sensorimotor-synchronization-to-the-beat-in-children-with-developmental-dyslexia-an-eeg-study
#20
Lincoln J Colling, Hannah L Noble, Usha Goswami
Tapping in time to a metronome beat (hereafter beat synchronization) shows considerable variability in child populations, and individual differences in beat synchronization are reliably related to reading development. Children with developmental dyslexia show impairments in beat synchronization. These impairments may reflect deficiencies in auditory perception of the beat which in turn affect auditory-motor mapping, or may reflect an independent motor deficit. Here, we used a new methodology in EEG based on measuring beat-related steady-state evoked potentials (SS-EPs, Nozaradan et al...
2017: Frontiers in Neuroscience
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