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https://www.readbyqxmd.com/read/28424400/-brodmann-areas-39-and-40-human-parietal-association-area-and-higher-cortical-function
#1
Yasuhisa Sakurai
The anatomy and function of the angular gyrus (Brodmann Area 39) and supramarginal gyrus (Brodmann Area 40) are described here. Both gyri constitute the inferior part of the parietal lobe. Association fibers from the angular gyrus project to the dorsolateral prefrontal cortex via the superior longitudinal fasciculus (SLF) II/arcuate fasciculus (AF), whereas those from the supramarginal gyrus project to the ventrolateral prefrontal cortex via SLF III/AF. Damage to the left angular gyrus causes kanji agraphia (lexical agraphia) and mild anomia, whereas damage to the left supramarginal gyrus causes kana alexia (phonological dyslexia) and kana agraphia (phonological agraphia)...
April 2017: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/28306348/differences-in-dyslexic-students-before-and-after-a-remediation-program-a-clinical-neuropsychological-and-event-related-potential-study
#2
Nikolaos C Zygouris, Elias Avramidis, Argyris V Karapetsas, George I Stamoulis
Developmental dyslexia is defined as an unexpected specific and persistent failure to acquire efficient reading skills despite conventional instruction, adequate intelligence and sociocultural opportunity. This article reports the outcomes of a study that evaluated the implementation of a 4-month intervention program. The intervention consisted of structured activities aiming at improving (a) the children's phonological awareness, (b) their visual and auditory memory, (c) their visual discrimination ability, and (d) their text comprehension...
March 17, 2017: Applied Neuropsychology. Child
https://www.readbyqxmd.com/read/28199175/sequential-prediction-of-literacy-achievement-for-specific-learning-disabilities-contrasting-in-impaired-levels-of-language-in-grades-4-to-9
#3
Elizabeth A Sanders, Virginia W Berninger, Robert D Abbott
Sequential regression was used to evaluate whether language-related working memory components uniquely predict reading and writing achievement beyond cognitive-linguistic translation for students in Grades 4 through 9 ( N = 103) with specific learning disabilities (SLDs) in subword handwriting (dysgraphia, n = 25), word reading and spelling (dyslexia, n = 60), or oral and written language (oral and written language learning disabilities, n = 18). That is, SLDs are defined on the basis of cascading level of language impairment (subword, word, and syntax/text)...
February 1, 2017: Journal of Learning Disabilities
https://www.readbyqxmd.com/read/28115055/dyslexics-faster-decay-of-implicit-memory-for-sounds-and-words-is-manifested-in-their-shorter-neural-adaptation
#4
Sagi Jaffe-Dax, Or Frenkel, Merav Ahissar
Dyslexia is a prevalent reading disability whose underlying mechanisms are still disputed. We studied the neural mechanisms underlying dyslexia using a simple frequency-discrimination task. Though participants were asked to compare the two tones in each trial, implicit memory of previous trials affected their responses. We hypothesized that implicit memory decays faster among dyslexics. We tested this by increasing the temporal intervals between consecutive trials, and by measuring the behavioral impact and ERP responses from the auditory cortex...
January 24, 2017: ELife
https://www.readbyqxmd.com/read/28114605/auditory-stimulus-processing-and-task-learning-are-adequate-in-dyslexia-but-benefits-from-regularities-are-reduced
#5
Luba Daikhin, Ofri Raviv, Merav Ahissar
Purpose: The reading deficit for people with dyslexia is typically associated with linguistic, memory, and perceptual-discrimination difficulties, whose relation to reading impairment is disputed. We proposed that automatic detection and usage of serial sound regularities for individuals with dyslexia is impaired (anchoring deficit hypothesis), leading to the formation of less reliable sound predictions. Agus, Carrión-Castillo, Pressnitzer, and Ramus, (2014) reported seemingly contradictory evidence by showing similar performance by participants with and without dyslexia in a demanding auditory task that contained task-relevant regularities...
February 1, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28089431/adults-with-developmental-dyslexia-show-selective-impairments-in-time-based-and-self-initiated-prospective-memory-self-report-and-clinical-evidence
#6
James H Smith-Spark, Adam P Zięcik, Christopher Sterling
BACKGROUND: Prospective memory (PM; memory for delayed intentions) would seem to be impaired in dyslexia but evidence is currently limited in scope. AIMS: There is a need, therefore, firstly, to explore PM under controlled conditions using a broader range of PM tasks than used previously and, secondly, to determine whether objectively measured and self-reported PM problems can be found in the same individuals with dyslexia. METHODS AND PROCEDURES: The responses of 30 adults with dyslexia were compared with those of 30 IQ-matched adults without dyslexia on a self-report and a clinical measure of PM...
March 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/27866493/dietary-dha-and-health-cognitive-function-ageing
#7
Carlos Cardoso, Cláudia Afonso, Narcisa M Bandarra
DHA is a key nutritional n-3 PUFA and needs to be supplied by the human diet. DHA is found in significant amounts in the retinal and neuronal cell membranes due to its high fluidity. Indeed, DHA is selectively concentrated in the synaptic and retinal membranes. DHA is deemed to display anti-inflammatory properties and to reduce the risk of CVD. Consumption of larger amounts of DHA appears to reduce the risk of depression, bipolar disorder, schizophrenia and mood disorders. Conversely, it has been shown that loss of DHA from the nerve cell membrane leads to dysfunction of the central nervous system in the form of anxiety, irritability, susceptibility to stress, dyslexia, impaired memory and cognitive functions, and extended reaction times...
December 2016: Nutrition Research Reviews
https://www.readbyqxmd.com/read/27753210/prosodic-similarity-effects-in-short-term-memory-in-developmental-dyslexia
#8
Usha Goswami, Lisa Barnes, Natasha Mead, Alan James Power, Victoria Leong
Children with developmental dyslexia are characterized by phonological difficulties across languages. Classically, this 'phonological deficit' in dyslexia has been investigated with tasks using single-syllable words. Recently, however, several studies have demonstrated difficulties in prosodic awareness in dyslexia. Potential prosodic effects in short-term memory have not yet been investigated. Here we create a new instrument based on three-syllable words that vary in stress patterns, to investigate whether prosodic similarity (the same prosodic pattern of stressed and unstressed syllables) exerts systematic effects on short-term memory...
November 2016: Dyslexia: the Journal of the British Dyslexia Association
https://www.readbyqxmd.com/read/27752247/the-nature-of-verbal-short-term-impairment-in-dyslexia-the-importance-of-serial-order
#9
REVIEW
Steve Majerus, Nelson Cowan
Verbal short-term memory (STM) impairment is one of the most consistent associated deficits observed in developmental reading disorders such as dyslexia. Few studies have addressed the nature of this STM impairment, especially as regards the ability to temporarily store serial order information. This question is important as studies in typically developing children have shown that serial order STM abilities are predictors of oral and written language development. Associated serial order STM deficits in dyslexia may therefore further increase the learning difficulties in these populations...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27747988/longitudinal-stability-of-pre-reading-skill-profiles-of-kindergarten-children-implications-for-early-screening-and-theories-of-reading
#10
Ola Ozernov-Palchik, Elizabeth S Norton, Georgios Sideridis, Sara D Beach, Maryanne Wolf, John D E Gabrieli, Nadine Gaab
Research suggests that early identification of developmental dyslexia is important for mitigating the negative effects of dyslexia, including reduced educational attainment and increased socioemotional difficulties. The strongest pre-literacy predictors of dyslexia are rapid automatized naming (RAN), phonological awareness (PA), letter knowledge, and verbal short-term memory. The relationship among these constructs has been debated, and several theories have emerged to explain the unique role of each in reading ability/disability...
October 17, 2016: Developmental Science
https://www.readbyqxmd.com/read/27739162/the-effects-of-visual-attention-span-and-phonological-decoding-in-reading-comprehension-in-dyslexia-a-path-analysis
#11
Chen Chen, Matthew H Schneps, Katherine E Masyn, Jennifer M Thomson
Increasing evidence has shown visual attention span to be a factor, distinct from phonological skills, that explains single-word identification (pseudo-word/word reading) performance in dyslexia. Yet, little is known about how well visual attention span explains text comprehension. Observing reading comprehension in a sample of 105 high school students with dyslexia, we used a pathway analysis to examine the direct and indirect path between visual attention span and reading comprehension while controlling for other factors such as phonological awareness, letter identification, short-term memory, IQ and age...
November 2016: Dyslexia: the Journal of the British Dyslexia Association
https://www.readbyqxmd.com/read/27734840/genetic-polymorphism-of-nonsyndromic-cleft-lip-with-or-without-cleft-palate-is-associated-with-developmental-dyslexia-in-chinese-school-aged-populations
#12
Bin Wang, Yuxi Zhou, Song Leng, Liyuan Zheng, Hong Lv, Fei Wang, Li-Hai Tan, Yimin Sun
Developmental dyslexia (DD) is a neurodevelopment disorder characterized by reading disabilities without apparent etiologies. Nonsyndromic cleft lip with or without cleft palate (NSCL/P) is a structural craniofacial malformation featured by isolated orofacial abnormalities. Despite substantial phenotypic differences, potential linkage between these two disorders has been suggested as prevalence of DD among NSCL/P patients was much higher than that in general populations. Previous neuroimaging studies observed impaired short-term memory in patients with DD and NSCL/P, respectively...
February 2017: Journal of Human Genetics
https://www.readbyqxmd.com/read/27695426/an-extension-of-the-procedural-deficit-hypothesis-from-developmental-language-disorders-to-mathematical-disability
#13
Tanya M Evans, Michael T Ullman
Mathematical disability (MD) is a neurodevelopmental disorder affecting math abilities. Here, we propose a new explanatory account of MD, the procedural deficit hypothesis (PDH), which may further our understanding of the disorder. According to the PDH of MD, abnormalities of brain structures subserving the procedural memory system can lead to difficulties with math skills learned in this system, as well as problems with other functions that depend on these brain structures. This brain-based account is motivated in part by the high comorbidity between MD and language disorders such as dyslexia that may be explained by the PDH, and in part by the likelihood that learning automatized math skills should depend on procedural memory...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27575597/dyslexia-limits-the-ability-to-categorize-talker-dialect
#14
Gayle Beam Long, Robert Allen Fox, Ewa Jacewicz
Purpose: The purpose of this study was to determine whether the underlying phonological impairment in dyslexia is associated with a deficit in categorizing regional dialects. Method: Twenty adults with dyslexia, 20 school-age children with dyslexia, and 40 corresponding control listeners with average reading ability listened to sentences produced by multiple talkers (both sexes) representing two dialects: Midland dialect in Ohio (same as listeners' dialect) and Southern dialect in Western North Carolina...
October 1, 2016: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/27551263/improving-dorsal-stream-function-in-dyslexics-by-training-figure-ground-motion-discrimination-improves-attention-reading-fluency-and-working-memory
#15
Teri Lawton
There is an ongoing debate about whether the cause of dyslexia is based on linguistic, auditory, or visual timing deficits. To investigate this issue three interventions were compared in 58 dyslexics in second grade (7 years on average), two targeting the temporal dynamics (timing) of either the auditory or visual pathways with a third reading intervention (control group) targeting linguistic word building. Visual pathway training in dyslexics to improve direction-discrimination of moving test patterns relative to a stationary background (figure/ground discrimination) significantly improved attention, reading fluency, both speed and comprehension, phonological processing, and both auditory and visual working memory relative to controls, whereas auditory training to improve phonological processing did not improve these academic skills significantly more than found for controls...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27465208/responsiveness-to-intervention-in-children-with-dyslexia
#16
Elisabeth A T Tilanus, Eliane Segers, Ludo Verhoeven
We examined the responsiveness to a 12-week phonics intervention in 54 s-grade Dutch children with dyslexia, and compared their reading and spelling gains to a control group of 61 typical readers. The intervention aimed to train grapheme-phoneme correspondences (GPCs), and word reading and spelling by using phonics instruction. We examined the accuracy and efficiency of grapheme-phoneme correspondences, decoding words and pseudowords, as well as the accuracy of spelling words before and after the intervention...
August 2016: Dyslexia: the Journal of the British Dyslexia Association
https://www.readbyqxmd.com/read/27425262/a-systematic-review-of-controlled-trials-on-visual-stress-using-intuitive-overlays-or-the-intuitive-colorimeter
#17
REVIEW
Bruce J W Evans, Peter M Allen
Claims that coloured filters aid reading date back 200 years and remain controversial. Some claims, for example, that more than 10% of the general population and 50% of people with dyslexia would benefit from coloured filters lack sound evidence and face validity. Publications with such claims typically cite research using methods that have not been described in the scientific literature and lack a sound aetiological framework. Notwithstanding these criticisms, some researchers have used more rigorous selection criteria and methods of prescribing coloured filters that were developed at a UK Medical Research Council unit and which have been fully described in the scientific literature...
October 2016: Journal of Optometry
https://www.readbyqxmd.com/read/27422537/visual-naming-deficits-in-dyslexia-an-erp-investigation-of-different-processing-domains
#18
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
#19
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/27121331/self-reports-of-increased-prospective-and-retrospective-memory-problems-in-adults-with-developmental-dyslexia
#20
James H Smith-Spark, Adam P Zięcik, Christopher Sterling
Short-term and working memory problems in dyslexia are well-documented, but other memory domains have received little empirical scrutiny, despite some evidence to suggest that they might be impaired. Prospective memory is memory for delayed intentions, whilst retrospective memory relates to memory for personally experienced past events. To gain an understanding of subjective everyday memory experience, a self-report measure designed to tap prospective and retrospective memory was administered to 28 adults with dyslexia and 26 IQ-matched adults without dyslexia...
August 2016: Dyslexia: the Journal of the British Dyslexia Association
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