Eye closure enhances dark night perceptions
Identifieur interne : 000893 ( Main/Curation ); précédent : 000892; suivant : 000894Eye closure enhances dark night perceptions
Auteurs : Stefan Brodoehl [Allemagne] ; Carsten M. Klingner [Allemagne] ; Otto W. Witte [Allemagne]Source :
- Scientific Reports [ 2045-2322 ] ; 2015.
Abstract
We often close our eyes when we explore objects with our fingers to reduce the dominance of the visual system over our other senses. Here we show that eye closure, even in complete darkness, results in improved somatosensory perception due to a switch from visual predominance towards a somatosensory processing mode. Using a tactile discrimination task and functional neuroimaging (fMRI) data were acquired from healthy subjects with their eyes opened and closed in two environments: under ambient light and in complete darkness. Under both conditions the perception threshold decreased when subjects closed their eyes, and their fingers became more sensitive. In complete darkness, eye closure significantly increased occipital blood-oxygen-level-dependent (BOLD) activity in the somatosensory and secondary visual processing areas. This change in brain activity was associated with enhanced coupling between the sensory thalamus and somatosensory cortex; connectivity between the visual and somatosensory areas decreased. The present study demonstrates that eye closure improves somatosensory perception not merely due to the lack of visual signals; instead, the act of closing the eyes itself alters the processing mode in the brain: with eye closure the brain switches from thalamo-cortical networks with visual dominance to a non-visually dominated processing mode.
Url:
DOI: 10.1038/srep10515
PubMed: 26012706
PubMed Central: 4444970
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Witte</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Hans Berger Department of Neurology, University of Jena</institution>,<country>Germany</country></nlm:aff><country xml:lang="fr">Allemagne</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation><affiliation wicri:level="1"><nlm:aff id="a2"><institution>Brain Imaging Center, University of Jena</institution>,<country>Germany</country></nlm:aff><country xml:lang="fr">Allemagne</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26012706</idno><idno type="pmc">4444970</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4444970</idno><idno type="RBID">PMC:4444970</idno><idno type="doi">10.1038/srep10515</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000630</idno><idno type="wicri:Area/Pmc/Curation">000630</idno><idno type="wicri:Area/Pmc/Checkpoint">000578</idno><idno type="wicri:Area/Ncbi/Merge">003965</idno><idno type="wicri:Area/Ncbi/Curation">003965</idno><idno type="wicri:Area/Ncbi/Checkpoint">003965</idno><idno type="wicri:Area/Main/Merge">000893</idno><idno type="wicri:Area/Main/Curation">000893</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Eye closure enhances dark night perceptions</title><author><name sortKey="Brodoehl, Stefan" sort="Brodoehl, Stefan" uniqKey="Brodoehl S" first="Stefan" last="Brodoehl">Stefan Brodoehl</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Hans Berger Department of Neurology, University of Jena</institution>,<country>Germany</country></nlm:aff><country xml:lang="fr">Allemagne</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation><affiliation wicri:level="1"><nlm:aff id="a2"><institution>Brain Imaging Center, University of Jena</institution>,<country>Germany</country></nlm:aff><country xml:lang="fr">Allemagne</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Klingner, Carsten M" sort="Klingner, Carsten M" uniqKey="Klingner C" first="Carsten M." last="Klingner">Carsten M. Klingner</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Hans Berger Department of Neurology, University of Jena</institution>,<country>Germany</country></nlm:aff><country xml:lang="fr">Allemagne</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation><affiliation wicri:level="1"><nlm:aff id="a2"><institution>Brain Imaging Center, University of Jena</institution>,<country>Germany</country></nlm:aff><country xml:lang="fr">Allemagne</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Witte, Otto W" sort="Witte, Otto W" uniqKey="Witte O" first="Otto W." last="Witte">Otto W. Witte</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Hans Berger Department of Neurology, University of Jena</institution>,<country>Germany</country></nlm:aff><country xml:lang="fr">Allemagne</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation><affiliation wicri:level="1"><nlm:aff id="a2"><institution>Brain Imaging Center, University of Jena</institution>,<country>Germany</country></nlm:aff><country xml:lang="fr">Allemagne</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></analytic><series><title level="j">Scientific Reports</title><idno type="eISSN">2045-2322</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>We often close our eyes when we explore objects with our fingers to reduce the dominance of the visual system over our other senses. Here we show that eye closure, even in complete darkness, results in improved somatosensory perception due to a switch from visual predominance towards a somatosensory processing mode. Using a tactile discrimination task and functional neuroimaging (fMRI) data were acquired from healthy subjects with their eyes opened and closed in two environments: under ambient light and in complete darkness. Under both conditions the perception threshold decreased when subjects closed their eyes, and their fingers became more sensitive. In complete darkness, eye closure significantly increased occipital blood-oxygen-level-dependent (BOLD) activity in the somatosensory and secondary visual processing areas. This change in brain activity was associated with enhanced coupling between the sensory thalamus and somatosensory cortex; connectivity between the visual and somatosensory areas decreased. The present study demonstrates that eye closure improves somatosensory perception not merely due to the lack of visual signals; instead, the act of closing the eyes itself alters the processing mode in the brain: with eye closure the brain switches from thalamo-cortical networks with visual dominance to a non-visually dominated processing mode.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Colavita, F B" uniqKey="Colavita F">F. B. Colavita</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Hartcher O Rien, J" uniqKey="Hartcher O Rien J">J. Hartcher-O’Brien</name></author><author><name sortKey="Gallace, A" uniqKey="Gallace A">A. Gallace</name></author><author><name sortKey="Krings, B" uniqKey="Krings B">B. Krings</name></author><author><name sortKey="Koppen, C" uniqKey="Koppen C">C. Koppen</name></author><author><name sortKey="Spence, C" uniqKey="Spence C">C. 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