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
ERP C1 is top-down modulated by orientation perceptual learning
TL;DR: It is concluded that ERP C1 can be top-down modulated in a task-specific manner by high-level perceptual learning, so that C1 changes may not necessarily indicate plasticity in the early visual cortex.
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“Emotions Guide Us”: Behavioral and MEG correlates
Fabien D'Hondt,Maryse Lassonde,Olivier Collignon,Franco Lepore,Jacques Honoré,Henrique Sequeira +5 more
TL;DR: It is suggested that the prior spatial distribution of emotional salience, like physical Salience, grabs attentional resources and modifies the performance in the center of the visual field.
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Electromagnetic Manifestations of Mind and Brain
Alice Mado Proverbio,Alberto Zani +1 more
- 01 Jan 2003
TL;DR: In this article, the authors discuss the principles underlying the nature of the electromagnetic signal, including a description of the intracortical sources of the potentials recorded from scalp surface, and the methods of analyzing and identifying the best known components of these signals based on their functional properties.
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Oblique effect in visual mismatch negativity
Endre Takacs,Endre Takacs,István Sulykos,István Sulykos,István Czigler,István Czigler,Irén Barkaszi,Irén Barkaszi,László Balázs +8 more
TL;DR: Evidence that perception of change could be accomplished at significantly smaller thresholds, than what elicits vMMN is provided, as changes from cardinal orientations represent a more detectable signal for the automatic change detection system than changes from oblique angles.
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