Analysis of striate activity underlying the pattern onset EP of children

Ossenblok, Pauly; Reits, D.; Spekreijse, H.

doi:10.1016/0042-6989(92)90044-j

Cited by 29 publications

(16 citation statements)

References 19 publications

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“…Second, only 1 patient had extensive coverage of the occipital lobe; the other 3 had fewer electrodes, most of which were located in the lateral occipital cortex. We believe that it is possible to extrapolate these data to the general population because the results were consistent among our patients, agree with the cortical VEP recordings by other researchers (16,17), and coincide, in a broad sense, with many mathematical models proposed for VEP generation (22)(23)(24). Third, the areas in the depths of the calcarine fissure were not amenable to recording with subdural electrodes.…”

Section: Possible Methodological Limitationssupporting

confidence: 89%

Neuronal Generators of Visual Evoked Potentials in Humans: Visual Processing in the Human Cortex

et al. 1997

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Summary: Purpose:We wished to define the localization of cortical generators of visual (pattern) evoked potentials (VEP) and the temporal sequence of activation in the occipital region.Methods: In 4 candidates for epilepsy surgery, a large array of subdural electrodes was placed over occipital areas. Checkerboard pattern reversal stimuli were generated and the epileptogenic focus was localized and functionally mapped. Magnetic resonance imaging did not show any occipital lesions in any of the 4 patients.Results: The area first activated was the lingual gyrus in the mesial occipital lobe (negative potential peaks at -70 ms), followed by an area superior to the calcarine fissure (negative peaks at -80 ms). Later (starting at -90 ms), there were positive potentials over the occipital pole and lingual gyrus, followed by potentials at the lateral occipital lobe.Conclusions: These data support the idea that VEP are generated in the mesial and lateral occipital cortex by different circumscribed neuronal generators with different latencies of activation. The scalp-recorded N1 and P1 potential peaks most likely derive from the progressive activation of neuronal masses in different regions of the occipital lobe.

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Section: Possible Methodological Limitationssupporting

confidence: 89%

Neuronal Generators of Visual Evoked Potentials in Humans: Visual Processing in the Human Cortex

et al. 1997

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“…The morphology of the VEPs recorded in these children and adults agree with previous studies in that a positive deflection was the major component in the children's L-M chromatic contrast (P166) [3,6,7] and achromatic resolution VEPs (P135) [5,15,46]. For the adults, a negative deflection (N135) was the major component for the L-M chromatic contrast VEPs and a positive deflection (P135) for the achromatic resolution VEPs, also in agreement with the literature [6,[11][12][13][14].…”

Section: Vep Morphologysupporting

confidence: 85%

EEG alpha rhythms and transient chromatic and achromatic pattern visual evoked potentials in children and adults

et al. 2011

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Transient chromatic pattern visual evoked potentials (VEPs) have been found to be less repeatable in morphology in children than in adults at low to moderate chromatic contrasts. The purpose of this study is to investigate whether low repeatability of VEP components can be associated with high alpha power, in a comparison of alpha activity in children and adults. Transient chromatic contrast and achromatic resolution VEPs were recorded in children (n = 14, mean 9.6 years) and adults (n = 12, mean 21.8 years) with normal vision and assessed for repeatability. Isoluminant chromatic (magenta-cyan) and luminance-modulated achromatic grating stimuli were presented at and above psychophysical threshold levels, in pattern onset-offset at 2 Hz temporal frequency. EEGs (eyes closed and open) were recorded as single sweeps (1 s long) over three 30 s periods while facing a uniform computer display. An index of VEP detectability by observation was developed based on VEP component repeatability. The index was examined for correlations with alpha-wave parameters. Alpha power was calculated as the sum of the powers of 8-13 Hz frequencies of the EEG sweeps (using the discrete Fourier transform). Alpha power variability was calculated using the standard deviation of the powers of each sweep in a 30 s time period. The children had significantly higher alpha powers than the adults for both the eyes-open and eyes-closed conditions. Alpha power variability was significantly higher for the eyes-open condition only. There was no relationship between alpha power parameters and index of VEP detectability by observation for both the chromatic and achromatic grating stimuli. Poor repeatability of transient pattern VEPs is not associated with high alpha power or its variability in EEG measurements in older children or young adults at Oz.

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“…The waveforms of the extrastriate components of the different subjects studied look very much alike. Thus, waveform changes as a function of age due to changes at the neuronal level, as reported for the striate component (Ossenblok et al, 1992), are not apparent for the extrastriate component. Note that the strength profile of the extrastriate source and its contralateral origin is identical to the CI component of the adult response (Maier et al, 1987) which has an origin in area 18 of the visual cortex (Ossenblok & Spekreijse, 1991).…”

Section: Hemispheric Asymmetrymentioning

confidence: 72%

“…The responses are maximal at the midline of the head, above the inion. The wave form of the responses is characteristic for children of this age (Ossenblok et al, 1992) and consists mainly of a negative-positive complex. For stimulation with a left half-field, however, also an early positive peak, at about 100 msec, becomes apparent in the responses [Fig.…”

Section: Resultsmentioning

confidence: 99%

Hemispheric asymmetry in the maturation of the extrastriate checkerboard onset evoked potential

Ossenblok¹,

Munck

Wieringa

et al. 1994

Vision Research

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Recently we have shown that the single positive deflection in the checkerboard onset evoked potential (EP) of young children of striate origin develops into a negative-positive complex. However, also an early positive peak becomes apparent in the checkerboard onset EP. To determine the origin and development of the activity underlying this early positive deflection we studied the checkerboard onset EPs in children of 9-16 years of age. It was found that for the children in this age group two different dipole sources are responsible for the activity underlying the pattern onset EP. One of the dipoles corresponds to the activity generated in the striate cortex, whereas a second dipole of extrastriate origin is responsible for the appearance of the early positive deflection. This extrastriate activity shows hemispheric asymmetry, i.e. the strength of the right hemispheric extrastriate source exceeds the strength of the left hemispheric source. These results are in accordance with histological studies of Conel (1939-1963) [The postnatal development of the human cerebral cortex (Vols 1-8). Cambridge, Mass.: Harvard Univ. Press] which show that the maturation of the extrastriate areas of the left hemisphere is delayed with respect to the right hemisphere.

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Analysis of striate activity underlying the pattern onset EP of children

Cited by 29 publications

References 19 publications

Neuronal Generators of Visual Evoked Potentials in Humans: Visual Processing in the Human Cortex

Neuronal Generators of Visual Evoked Potentials in Humans: Visual Processing in the Human Cortex

EEG alpha rhythms and transient chromatic and achromatic pattern visual evoked potentials in children and adults

Hemispheric asymmetry in the maturation of the extrastriate checkerboard onset evoked potential

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