Endogenous modulation of human visual cortex activity improves perception at twilight
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 ye...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20411723_v9_n1_p_Cordani http://hdl.handle.net/20.500.12110/paper_20411723_v9_n1_p_Cordani |
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paper:paper_20411723_v9_n1_p_Cordani |
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paper:paper_20411723_v9_n1_p_Cordani2023-06-08T16:33:09Z Endogenous modulation of human visual cortex activity improves perception at twilight ambient air brain performance assessment threshold twilight visual analysis article functional magnetic resonance imaging human modulation rest sensory cortex visual cortex adult anatomy and histology brain mapping diagnostic imaging male nuclear magnetic resonance imaging parietal lobe photoperiodicity physiology somatosensory cortex temporal lobe vision visual cortex Adult Brain Mapping Humans Magnetic Resonance Imaging Male Parietal Lobe Photoperiod Somatosensory Cortex Temporal Lobe Visual Cortex Visual Perception 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. © 2018 The Author(s). 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20411723_v9_n1_p_Cordani http://hdl.handle.net/20.500.12110/paper_20411723_v9_n1_p_Cordani |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
ambient air brain performance assessment threshold twilight visual analysis article functional magnetic resonance imaging human modulation rest sensory cortex visual cortex adult anatomy and histology brain mapping diagnostic imaging male nuclear magnetic resonance imaging parietal lobe photoperiodicity physiology somatosensory cortex temporal lobe vision visual cortex Adult Brain Mapping Humans Magnetic Resonance Imaging Male Parietal Lobe Photoperiod Somatosensory Cortex Temporal Lobe Visual Cortex Visual Perception |
| spellingShingle |
ambient air brain performance assessment threshold twilight visual analysis article functional magnetic resonance imaging human modulation rest sensory cortex visual cortex adult anatomy and histology brain mapping diagnostic imaging male nuclear magnetic resonance imaging parietal lobe photoperiodicity physiology somatosensory cortex temporal lobe vision visual cortex Adult Brain Mapping Humans Magnetic Resonance Imaging Male Parietal Lobe Photoperiod Somatosensory Cortex Temporal Lobe Visual Cortex Visual Perception Endogenous modulation of human visual cortex activity improves perception at twilight |
| topic_facet |
ambient air brain performance assessment threshold twilight visual analysis article functional magnetic resonance imaging human modulation rest sensory cortex visual cortex adult anatomy and histology brain mapping diagnostic imaging male nuclear magnetic resonance imaging parietal lobe photoperiodicity physiology somatosensory cortex temporal lobe vision visual cortex Adult Brain Mapping Humans Magnetic Resonance Imaging Male Parietal Lobe Photoperiod Somatosensory Cortex Temporal Lobe Visual Cortex Visual Perception |
| description |
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. © 2018 The Author(s). |
| title |
Endogenous modulation of human visual cortex activity improves perception at twilight |
| title_short |
Endogenous modulation of human visual cortex activity improves perception at twilight |
| title_full |
Endogenous modulation of human visual cortex activity improves perception at twilight |
| title_fullStr |
Endogenous modulation of human visual cortex activity improves perception at twilight |
| title_full_unstemmed |
Endogenous modulation of human visual cortex activity improves perception at twilight |
| title_sort |
endogenous modulation of human visual cortex activity improves perception at twilight |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20411723_v9_n1_p_Cordani http://hdl.handle.net/20.500.12110/paper_20411723_v9_n1_p_Cordani |
| _version_ |
1768545485257179136 |