Artículo
Endogenous modulation of human visual cortex activity improves perception at twilight
Cordani, Lorenzo; Tagliazucchi, Enzo Rodolfo
; Vetter, Céline; Hassemer, Christian; Roenneberg, Till; Stehle, Jörg H.; Kell, Christian A.
![Icon](/themes/CONICETDigital/images/conicet.png)
Fecha de publicación:
12/2018
Editorial:
Nature Publishing Group
Revista:
Nature Communications
ISSN:
2041-1723
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Perception, particularly in the visual domain, is drastically influenced by rhythmic changes in ambient lighting conditions. Anticipation of daylight changes by the circadian system is critical for survival. However, the neural bases of time-of-day-dependent modulation in human perception are not yet understood. We used fMRI to study brain dynamics during resting-state and close-to-threshold visual perception repeatedly at six times of the day. Here we report that resting-state signal variance drops endogenously at times coinciding with dawn and dusk, notably in sensory cortices only. In parallel, perception-related signal variance in visual cortices decreases and correlates negatively with detection performance, identifying an anticipatory mechanism that compensates for the deteriorated visual signal quality at dawn and dusk. Generally, our findings imply that decreases in spontaneous neural activity improve close-to-threshold perception.
Palabras clave:
CIRCADIAN
,
PERCEPTION
,
NEUROIMAGING
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Identificadores
Colecciones
Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Cordani, Lorenzo; Tagliazucchi, Enzo Rodolfo; Vetter, Céline; Hassemer, Christian; Roenneberg, Till; et al.; Endogenous modulation of human visual cortex activity improves perception at twilight; Nature Publishing Group; Nature Communications; 9; 1; 12-2018; 1-9
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