scholarly journals Saccadic Alterations in Severe Developmental Dyslexia

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Stefano Pensiero ◽  
Agostino Accardo ◽  
Paola Michieletto ◽  
Paolo Brambilla
Keyword(s):  
Information Processing ◽  
Visual Evoked Potentials ◽  
Developmental Dyslexia ◽  
Visual Information ◽  
Motor Deficits ◽  
Internuclear Ophthalmoplegia ◽  
Saccadic Eye Movement ◽  
Ocular Motor ◽  
Pattern Visual Evoked Potentials ◽  
Rapid Visual Information Processing

It is not sure if persons with dyslexia have ocular motor deficits in addition to their deficits in rapid visual information processing. A 15-year-old boy afflicted by severe dyslexia was submitted to saccadic eye movement recording. Neurological and ophthalmic examinations were normal apart from the presence of an esophoria for near and slightly longer latencies of pattern visual evoked potentials. Subclinical saccadic alterations were present, which could be at the basis of the reading pathology: (1) low velocities (and larger durations) of the adducting saccades of the left eye with undershooting and long-lasting postsaccadic onward drift, typical of the internuclear ophthalmoplegia; (2) saccades interrupted in mid-flight and fixation instability, which are present in cases of brainstem premotor disturbances.

Evoked Potentials by Letters in Printed and Script Forms

1984 ◽  
Vol 59 (1) ◽  
pp. 227-232 ◽  
Author(s):  
Luciano Mecacci ◽  
Dario Salmaso
Keyword(s):  
Information Processing ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Adult Male ◽  
Visual Information ◽  
The Other ◽  
Behavioral Data ◽  
Evoked Responses ◽  
Amplitude Component ◽  
Male Subjects

Visual evoked potentials were recorded for 6 adult male subjects in response to single vowels and consonants in printed and script forms. Analysis showed the vowels in the printed form to have evoked responses with shorter latency (component P1 at about 133 msec.) and larger amplitude (component P1-N1) than the other letter-typeface combinations. No hemispheric asymmetries were found. The results partially agree with the behavioral data on the visual information-processing of letters.

Evidence for Ocular Motor Deficits in Developmental Dyslexia: Application of the Double-Step Paradigm

2006 ◽  
Vol 47 (10) ◽  
pp. 4401 ◽  
Author(s):  
Ronit Ram-Tsur ◽  
Miriam Faust ◽  
Avi Caspi ◽  
Carlos R. Gordon ◽  
Ari Z. Zivotofsky
Keyword(s):  
Developmental Dyslexia ◽  
Motor Deficits ◽  
Ocular Motor ◽  
Double Step

Impaired performance on the Rapid Visual Information Processing task (RVIP) could be an endophenotype of schizophrenia

2010 ◽  
Vol 177 (1-2) ◽  
pp. 60-64 ◽  
Author(s):  
Caroline Claudia Hilti ◽  
Leonie Maria Hilti ◽  
Doerthe Heinemann ◽  
Trevor Robbins ◽  
Erich Seifritz ◽  
...  
Keyword(s):  
Information Processing ◽  
Visual Information ◽  
Visual Information Processing ◽  
Processing Task ◽  
Impaired Performance ◽  
Rapid Visual Information Processing

Information-Processing Load and Variability of Visual Evoked Potentials

1982 ◽  
Vol 54 (3) ◽  
pp. 975-978
Author(s):  
Akihiro Yagi
Keyword(s):  
Information Processing ◽  
Foreign Language ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Visual Information ◽  
Visual Task ◽  
Auditory Task ◽  
Processing Load ◽  
The Mean ◽  
Visual Evoked

5 subjects were assigned two tasks during which they were simultaneously presented brightness-changes of the spot light on the CRT and the speech in a foreign language. They were asked to count the number of the changes in the visual task and listen to the speech to discern the content in the auditory task. A pair of averaged visual evoked potentials (VEP) to the brightness-changes were obtained for each task to calculate a subset correlation as an index of the variance of VEP. The mean correlation coefficient of VEP across the subjects was significantly higher during the visual task than that in the auditory task. This means that VEP was more stable during the visual task. The result suggests that the subset correlation measure might be available to evaluate visual information-processing load.

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