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State-dependent visual processing

Published in Frontiers in Psychology. 2011, vol. 2, p. 370
Abstract The temporal dynamics and anatomical correlates underlying human visual cognition are traditionally assessed as a function of stimulus properties and task demands. Any non-stimulus related activity is commonly dismissed as noise and eliminated to extract an evoked signal that is only a small fraction of the magnitude of the measured signal. We review studies that challenge this view by showing that non-stimulus related activity is not mere noise but that it has a well-structured organization which can largely determine the processing of upcoming stimuli. We review recent evidence from human electrophysiology that shows how different aspects of pre-stimulus activity such as pre-stimulus EEG frequency power and phase and pre-stimulus EEG microstates can determine qualitative and quantitative properties of both lower and higher-level visual processing. These studies show that low-level sensory processes depend on the momentary excitability of sensory cortices whereas perceptual processes leading to stimulus awareness depend on momentary pre-stimulus activity in higher-level non-visual brain areas. Also speed and accuracy of stimulus identification have likewise been shown to be modulated by pre-stimulus brain states.
PMID: 22203809
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Article (Published version) (1.3 MB) - public document Free access
Research group Organisation et plasticité des réseaux neuronaux cérébraux (148)
Projects CIBM
FNS: 132952
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BRITZ, Juliane, MICHEL, Christoph. State-dependent visual processing. In: Frontiers in Psychology, 2011, vol. 2, p. 370. https://archive-ouverte.unige.ch/unige:23665

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Deposited on : 2012-11-01

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