An event-related potential study on the interaction between lighting level and stimulus spatial location
EntityUAM. Departamento de Psicología Biológica y de la Salud
PublisherFrontiers Research Foundation
10.3389/fnhum.2015.00637Frontiers in Human Neuroscience 9 (2015): 637
Funded byThis work was supported by the grant PSI2014-54853-P and PSI2012-37090 from the Ministerio de Economía y Competitividad of Spain (MINECO)
ProjectGobierno de España. PSI2014-54853-P; Gobierno de España. PSI2012-37090
SubjectsCentral vision; Environmental light; Event-related potentials (ERPs); Mesopic vision; Peripheral vision; Photoreceptors; Visual stimuli; Psicología
Rights© 2015 Carretié, Ruiz-Padial and Mendoza
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.
Due to heterogeneous photoreceptor distribution, spatial location of stimulation is crucial to study visual brain activity in different light environments. This unexplored issue was studied through occipital event-related potentials (ERPs) recorded from 40 participants in response to discrete visual stimuli presented at different locations and in two environmental light conditions, low mesopic (L, 0.03 lux) and high mesopic (H, 6.5 lux), characterized by a differential photoreceptor activity balance: rod > cone and rod < cone, respectively. Stimuli, which were exactly the same in L and H, consisted of squares presented at ﬁxation, at the vertical periphery (above or below ﬁxation) or at the horizontal periphery (left or right). Analyses showed that occipital ERPs presented important L vs. H differences in the 100 to 450 ms window, which were signiﬁcantly modulated by spatial location of stimulation: differences were greater in response to peripheral stimuli than to stimuli presented at ﬁxation. Moreover, in the former case, signiﬁcance of L vs. H differences was even stronger in response to stimuli presented at the horizontal than at the vertical periphery. These low vs. high mesopic differences may be explained by photoreceptor activation and their retinal distribution, and conﬁrm that ERPs discriminate between rod– and cone-originated visual processing
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Retinotopy of emotion: Perception of negatively valenced stimuli presented at different spatial locations as revealed by event-related potentials Carretié, Luis; Méndez-Bértolo, Constantino; Bódalo, Cristina; Hernández-Lorca, María; Fernández-Folgueiras, Uxía; Fondevila, Sabela; Giménez-Fernández, Tamara
Ruiz-Padial, Elisabeth; Carretié Arangüena, Luis