Journal Article10.1002/HBM.460020306
Identification of early visual evoked potential generators by retinotopic and topographic analyses
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TL;DR: This study investigated the cortical sources of the early components of the pattern‐onset visual evoked potential (VEP) and found the C1 component was found to change its polarity and topography systematically as a function of stimulus position in a manner consistent with the retinotopic organization of the striate cortex.
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Abstract: This study investigated the cortical sources of the early (50-250 ms) components of the pattern-onset visual evoked potential (VEP) VEPs were recorded in response to a small circular checkerboard stimulus that was flashed over a range of visual field positions Temporally and spatially overlapping VEP components were distinguished by differences in retinotopic sensitivity and scalp topography, and by inverse dipole modeling The C1 component (50-80 ms) was found to change its polarity and topography systematically as a function of stimulus position in a manner consistent with the retinotopic organization of the striate cortex The P1 component (comprised of the P75 and P100 subcomponents) had a time course that overlapped the C1 but could be distinguished from the C1 by its differing topography and reduced sensitivity to stimulus position The P1 generators were localized to the lateral extrastriate cortex Inverse dipole models were consistent with these striate and extrastriate source locations for the C1 and P1, respectively The N1 component (120-180 ms) was found to originate from several spatially distinct generators that differed in their retinotopic organization © 1995 Wiley-Liss, Inc
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Citations
Localizing Visual Discrimination Processes in Time and Space
TL;DR: Findings indicate that the earliest measurable correlates of discriminative operations in the visual system appear as neural activity in circumscribed regions of the ventral processing stream.
Rapid recurrent processing gates awareness in primary visual cortex
TL;DR: Recordings in subjects performing a substitution masking paradigm provide direct support for the notion that recurrent processing in V1 correlates with visual awareness and that attention and awareness involve distinct recurrent processing operations.
Exploiting individual primary visual cortex geometry to boost steady state visual evoked potentials.
TL;DR: A means to obtain more reliable measures of visual evoked activity purely through consideration of cortical geometry is demonstrated, which stands to impact both basic and clinical research using SSVEPs.
Electrophysiological study of visual processing in children with cochlear implants
David P. Corina,S. Coffey-Corina,Elizabeth Pierotti,Kelsey Mankel,Lee Miller +4 more
TL;DR: The results support a view that VEP changes reflect alterations to visual-sensory attention and saliency mechanisms rather than a re-mapping of auditory cortex, and suggest that early auditory deprivation may have temporally prolonged effects on visual system processing even after activation and use of cochlear implant.
Comparative analysis of early visual processes across presentation modalities: The event-related potential evoked by real-life, virtual reality, and planar objects.
Joanna Kisker,Marike Johnsdorf,Merle Sagehorn,Thomas Hofmann,Thomas Gruber,Benjamin Schöne +5 more
TL;DR: This study compares early visual processing across real-life, virtual reality, and planar objects using event-related potentials, finding comparable fundamental processes but differing magnitudes, with real-life and virtual reality yielding more similar responses than planar objects.
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