Comparison of visual information processing in school-age dyslexics and normal readers via motion-onset visual evoked potentials

Kubová, Zuzana; Kuba, M; Kremláček, Jan; Langrová, J.; Szanyi, Jana; F, Vít; Chutná, Marie

doi:10.1016/j.visres.2015.03.027

Cited by 10 publications

(9 citation statements)

References 47 publications

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“…Although the etiology of dyslexia is not well understood, the current view supports an impairment of phonological processing (Norton, Beach, & Gabrieli, 2014), as well as sensory deficits (e.g., Kubova et al, 2015;Schulte-K€ orne & Bruder, 2010;Stefanics, Fosker, et al, 2011). Auditory MMN has been extensively used to investigate the development of the auditory and speech systems (Cheour et al, 1998 …”

Section: Developmental Disordersmentioning

confidence: 97%

Visual mismatch negativity (vMMN): A review and meta-analysis of studies in psychiatric and neurological disorders

Kremláček

Kreegipuu

Tales

et al. 2016

Cortex

Self Cite

122

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The visual mismatch negativity (vMMN) response is an event-related potential (ERP) component, which is automatically elicited by events that violate predictions based on prior events. VMMN experiments use visual stimulus repetition to induce predictions, and vMMN is obtained by subtracting the response to rare unpredicted stimuli from those to frequent stimuli. One increasingly popular interpretation of the mismatch response postulates that vMMN, similar to its auditory counterpart (aMMN), represents a prediction error response generated by cortical mechanisms forming probabilistic representations of sensory signals. Here we discuss the physiological and theoretical basis of vMMN and review thirty-three studies from the emerging field of its clinical applications, presenting a meta-analysis of findings in schizophrenia, mood disorders, substance abuse, neurodegenerative disorders, developmental disorders, deafness, panic disorder and hypertension. Furthermore, we include reports on aging and maturation as they bear upon many clinically relevant conditions. Surveying the literature we found that vMMN is altered in several clinical populations which is in line with aMMN findings. An important potential advantage of vMMN however is that it allows the investigation of deficits in predictive processing in cognitive domains which rely primarily on visual information; a principal sensory modality and thus of vital importance in environmental information processing and response, and a modality which arguably may be more sensitive to some pathological changes. However, due to the relative infancy of research in vMMN compared to aMMN in clinical populations its potential for clinical application is not yet fully appreciated. The aim of this review and meta-analysis therefore is to present, in a detailed systematic manner, the findings from clinically-based vMMN studies, to discuss their potential impact and application, to raise awareness of this measure and to improve our understanding of disease upon fundamental aspects of visual information processing. Furthermore, we include reports on aging and maturation as they bear upon many clinically relevant conditions. Surveying the literature we found that vMMN is altered in several 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 clinical populations which is in line with aMMN findings. An important potential advantage of vMMN however is that it allows the investigation of deficits in predictive processing in cognitive domains which rely primarily on visual information; a principal sensor...

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Section: Developmental Disordersmentioning

confidence: 97%

Visual mismatch negativity (vMMN): A review and meta-analysis of studies in psychiatric and neurological disorders

Kremláček

Kreegipuu

Tales

et al. 2016

Cortex

Self Cite

122

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“…Other studies have used different electrophysiological techniques, such as fixed spatial frequencies with high temporal frequencies and luminance variation,21,23 low spatial frequency and high temporal frequency stimuli (7.5 Hz),20,23 and, finally, recording of VEPs with the use of moving stimuli at low contrast,79 as well as at low contrast and radial motion full field and radial motion periphery 69. In all cases, they showed a significant increase in latencies and a reduction in the amplitudes of the waveform in dyslexic patients 24…”

Section: Discussionmentioning

confidence: 97%

“…Selective electrofunctional investigation of the M pathway requires the use of electrophysiological methods based on the recording of pattern visual evoked potentials (PVEP) and appropriately modified stimuli with regard to contrast, spatial frequency, temporal frequency, and movement 19–24…”

Section: Introductionmentioning

confidence: 99%

<p>Steady-State Pattern Electroretinogram and Frequency Doubling Technology in Adult Dyslexic Readers</p>

Schiavi

Finzi

Cellini

2019

OPTH

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PurposeDyslexia is a reading disorder with neurological deficit of the magnocellular pathway. The aim of our study was to evaluate the functionality of the magnocellular–Y (M–Y) retinal ganglion cells in adult dyslexic subjects using steady-state pattern electroretinogram and frequency doubling perimetry.MethodsTen patients with dyslexia (7 females and 3 males), mean age 28.7 ± 5.9 years, and 10 subjects without dyslexia (6 females and 4 males), mean age 27.8 ± 4.1 years, were enrolled in the study and underwent both steady-state pattern-electroretinogram examination and frequency doubling perimetry.ResultsThere was a significant difference in the amplitude of the steady-state pattern electroretinogram of the dyslexic group and the healthy controls (0.610±0.110 μV vs 1.250±0.296 μV; p=0.0001). Furthermore, in the dyslexic group we found a significant difference between the right eye and the left eye (0.671±0.11 μV vs 0.559±0.15 μV; p=0.001). With frequency doubling perimetry, the pattern standard deviation index increased in dyslexic eyes compared to healthy controls (4.40±0.81 dB vs 2.99±0.35 dB; p=0.0001) and in the left eye versus the right eye of the dyslexic group (4.43±1.10 dB vs 3.66±0.96 dB; p=0.031). There was a correlation between the reduction in the wave amplitude of the pattern electroretinogram and the simultaneous increase in the pattern standard deviation values (r=0.80; p=0.001). This correlation was also found to be present in the left eye (r=0.93; p<0.001) and the right eye (r=0.81; p=0.005) of dyslexic subjects.ConclusionOur study shows that there was an alteration of the activity of M–Y retinal ganglion cells, especially in the left eye. It confirms that in dyslexia there is a deficit of visual attention with damage not only of the magnocellular-dorsal pathway but also of the M-Y retinal ganglion cells.

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“…Various studies have reported higher, lower, and equal visual-spatial abilities with dyslexia. Some studies have reported the superiority of sight-spatial ability in dyslexic individuals but there were studies that did not recognize such processing between dyslexic and non-A dyslexic individuals [23][24][25][26][27], and even the weakness of this process in dyslexic individuals [28,29]. However, those studies that indicate the potential dysfunctional superiority in the field of visual-spatial ability can be a source of further and a new perspective on research in this field.…”

Section: Introduction Ccording To the Diagnostic And Statisticalmentioning

confidence: 99%

The Effectiveness of Educational Package Based on Visual-Spatial Processing in Reading Performance of Dyslexic Students

Vojoudi

Tafti

Ashkzari

2017

Avicenna. J. Neuro. Psycho. Physio.

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Background: Dyslexia refers to a kind of learning difficulty, a combination of strengths and weaknesses which affects the reading and spelling learning process. Objectives: The aim of current research was to develop an instructional package based on visual spatial abilities and examine its efficacy on the reading performance of students with dyslexia. Materials and Methods: This is a quasi-experimental study with pre-test, post-test design and control group. The statistical population included dyslexic students in the elementary schools of Hamadan City, Iran in the academic year 2016-2017. The sample size was 60 students that were randomly selected and assigned to the experimental and control groups (n=30 in each group). This study was conducted to investigate the effectiveness of an educational package based on visualspatial abilities in reading performance of dyslexic students. To achieve this aim, we designed an educational package based on visual-spatial abilities presented in 10 forty-minute sessions. Before training the package, the experimental and control group were taken a pre-test of reading abilities and the same test was repeated after receiving the package training. The data gathering tools were reading and dyslexia tests. The covariance test was used to analyze the research data. Results: The result indicated that the intervention was significantly effective in the subscales of words reading, word chain, word comprehension, text comprehension, and naming of the images. The results also showed that the educational package was not effective in other areas of reading, including rhyming, reading the non-words, removing the voices, marks of letters, and words. Conclusion: Based on the results, the visual-spatial package was effective in improving the reading skills of dyslexic students.

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Comparison of visual information processing in school-age dyslexics and normal readers via motion-onset visual evoked potentials

Cited by 10 publications

References 47 publications

Visual mismatch negativity (vMMN): A review and meta-analysis of studies in psychiatric and neurological disorders

Visual mismatch negativity (vMMN): A review and meta-analysis of studies in psychiatric and neurological disorders

<p>Steady-State Pattern Electroretinogram and Frequency Doubling Technology in Adult Dyslexic Readers</p>

The Effectiveness of Educational Package Based on Visual-Spatial Processing in Reading Performance of Dyslexic Students

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