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.

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.

Visual Evoked Potentials of Adaptation to Left-Right Reversed Vision

1994 ◽  
Vol 79 (2) ◽  
pp. 1047-1054 ◽  
Author(s):  
Yoichi Sugita
Keyword(s):  
Information Processing ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Visual Information ◽  
Time Course ◽  
Early Stage ◽  
Light Flash ◽  
Visual Information Processing ◽  
Optical Distortion ◽  
Visually Evoked Potentials

During the course of the adaptation to left-right reversed vision, visually evoked potentials (VEPs) were measured for a light flash presented on either side of a fixation. The VEP amplitudes and latencies changed drastically as the adaptation progressed. The time course of the change was quite different between occipital scalp loci. These results indicate that the adaptation to the optical distortion takes place even in the relatively early stage of the visual information processing.

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.

Visual information processing in recently abstaining methamphetamine-dependent individuals: evoked potentials study

2008 ◽  
Vol 117 (3) ◽  
pp. 245-255 ◽  
Author(s):  
Jan Kremláček ◽  
Ladislav Hosák ◽  
Miroslav Kuba ◽  
Jan Libiger ◽  
Jiří Čížek
Keyword(s):  
Information Processing ◽  
Evoked Potentials ◽  
Visual Information ◽  
Visual Information Processing

scholarly journals A Comprehensive Review on Methodologies Employed for Visual Evoked Potentials

Scientifica ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Ruchi Kothari ◽  
Pradeep Bokariya ◽  
Smita Singh ◽  
Ramji Singh
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Visual Processing ◽  
Visual Information ◽  
Extrastriate Cortex ◽  
Historical Aspect ◽  
Clinical Disorders ◽  
Bioelectric Signals ◽  
Visual Evoked

Visual information is fundamental to how we appreciate our environment and interact with others. The visual evoked potential (VEP) is among those evoked potentials that are the bioelectric signals generated in the striate and extrastriate cortex when the retina is stimulated with light which can be recorded from the scalp electrodes. In the current paper, we provide an overview of the various modalities, techniques, and methodologies which have been employed for visual evoked potentials over the years. In the first part of the paper, we cast a cursory glance on the historical aspect of evoked potentials. Then the growing clinical significance and advantages of VEPs in clinical disorders have been briefly described, followed by the discussion on the earlier and currently available methods for VEPs based on the studies in the past and recent times. Next, we mention the standards and protocols laid down by the authorized agencies. We then summarize the recently developed techniques for VEP. In the concluding section, we lay down prospective research directives related to fundamental and applied aspects of VEPs as well as offering perspectives for further research to stimulate inquiry into the role of visual evoked potentials in visual processing impairment related disorders.

Neurophysiologic correlates of implicit face memory in intracranial visual evoked potentials

Neurology ◽  
1997 ◽  
Vol 49 (5) ◽  
pp. 1312-1316 ◽  
Author(s):  
M. Seeck ◽  
N. Mainwaring ◽  
R. Cosgrove ◽  
H. Blume ◽  
D. Dubuisson ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Orbitofrontal Cortex ◽  
Evoked Responses ◽  
Push Button ◽  
Temporal Lobes ◽  
Clear Cut ◽  
Epileptic Patients ◽  
Explicit Recognition ◽  
Visual Evoked

Visual evoked potentials were recorded in the amygdala, hippocampus, mid- and inferotemporal cortex, orbitofrontal cortex, and lateral frontal cortex of seven epileptic patients while they were engaged in a difficult task requiring the discrimination between repeated and nonrepeated faces. The explicit recognition of previously seen faces was at chance levels, as measured by the accuracy of push-button responses. Nevertheless, all subjects showed clear-cut differential evoked responses to repeated versus nonrepeated faces, indicating implicit encoding of the distinction between the two types of stimuli. Differential responses were more frequent in neocortical recording sites (especially in the mid-and inferotemporal leads) than in limbic recording sites such as the amygdala and hippocampus. The authors conclude that implicit encoding processes are modulated by neocortical visual association areas of the temporal lobes.

Visual evoked potentials in rapid information processing

1985 ◽  
Vol 21 (4) ◽  
pp. 260-261
Author(s):  
Christoph Michel ◽  
Rico Nil ◽  
Roberto Buzzi ◽  
PhillipP. Woodson ◽  
Karl Bättig
Keyword(s):  
Information Processing ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Rapid Information Processing ◽  
Visual Evoked
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