Retinotopic mapping of visual event-related potentials

Abstract

Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in:Biological Psychology 118 (2016) ABSTRACTVisual stimulation is frequently employed in electroencephalographic (EEG) research.However, despite its widespread use, no studies have thoroughly evaluated how the morphology of the visual event-related potentials (ERPs) varies according to the spatial location of stimuli. Hence, the purpose of this study was to perform a detailed retinotopic mapping of visual ERPs. We recorded EEG activity while participants were visually stimulated with 60 pattern-reversing checkerboards placed at different polar angles and eccentricities. Our results show five pattern-reversal ERP components. C1and C2 components inverted polarity between the upper and lower hemifields. P1 and N1 showed higher amplitudes and shorter latencies to stimuli located in the contralateral lower quadrant. In contrast, P2 amplitude was enhanced and its latency was reduced by stimuli presented in the periphery of the upper hemifield. The retinotopic maps presented here could serve as a guide for selecting optimal visuo-spatial locations in future ERP studies. HIGHLIGHTS Extensive and multichannel retinotopic mapping of major visual ERP components. C1 and C2 components showed inverted polarity for upper and lower hemifields. P1 and N1 components were larger when the contralateral lower field was stimulated. P2 showed higher amplitude and shorter latency for peripheral upper field stimuli. Present results can be used to select optimal stimulus locations in ERP designs.

Retinotopy of emotion: Perception of negatively valenced stimuli presented at different spatial locations as revealed by event‐related potentials

“…Each input matrix (one for PN1 and another for PN2) consisted of 59 variables (i.e., EEG channels) and 2,652 cases (i.e., participants × stimulus category × stimulus location). In this case, no restrictions were introduced for factor selection besides the scree test, since some relevant components may present both anterior and posterior scalp maxima for different stimulus locations (e.g., P2: Capilla et al, ). PN1 and PN2 SF scores, which consist of a single value per SF (involving several electrodes) and are linearly related to amplitudes, were then submitted to a subsequent PCA.…”

“…To different extents, retinotopy extends to the visual extrastriate cortices and ventral and dorsal visual pathways (Sereno & Tootell, ). This retinotopy is reflected in event‐related potentials (ERPs), where the spatial location of the stimulation has a clear and direct reflection in the amplitude and polarity of visual components, particularly in the 80–250 ms interval: C1, P1, N1, and P2 (e.g., Capilla et al, ; Clark, Fan, & Hillyard, ). This stimulus location‐related variability of ERPs has been observed in response to nonemotional (checkerboards) stimuli, so it is independent of emotional load.…”

“…Importantly, the polarity of these components recorded at a particular scalp point changes depending on the spatial location of the visual scene where the stimulus appears. For example, C1 and P1 present opposite polarity for stimuli appearing in LoVF and UVF, and N1 also varies its polarity for LeVF and RVF locations (Capilla et al, ). Therefore, the label “N” or “P” becomes arbitrary when these components are evoked by stimuli presented at different spatial locations, as in the present study.…”

Comparing multifocal pupillographic objective perimetry (mfPOP) and multifocal visual evoked potentials (mfVEP) in retinal diseases

“…4). It is well established by combined fMRI and VEP methods that PO3, PO4 and nearby electrodes isolate striate cortical responses, while P7, P8, PO7, PO8 and their neighbours pick up human extra-striate cortical areas 18,193334 (see Discussion).…”

“…Both our mfPOP and mfVEP methods present onset stimuli. Capilla et al 34. used a 60 region, M-scaled, mfVEP stimulus presented within 22° of fixation and a 10–10 EEG array.…”