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  Circadian variability is negligible in primary visual cortices as measured by fNIRS

Schroeter, M. L., Bücheler, M. M., & Scheid, R. (2006). Circadian variability is negligible in primary visual cortices as measured by fNIRS. International Journal of Psychophysiology, 62(1), 9-13. doi:10.1016/j.ijpsycho.2005.11.003.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-A3F7-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-2703-8
Genre: Journal Article

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schroeter_circadian.pdf (Publisher version), 186KB
 
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 Creators:
Schroeter, Matthias L.1, Author              
Bücheler, Markus M.1, Author              
Scheid, Rainer1, Author              
Affiliations:
1Department Cognitive Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634563              

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Free keywords: Circadian; Hemodynamic response; Near-infrared spectroscopy; Neurovascular coupling; Optical imaging; Reliability; Variability
 Abstract: Neural activation leads to an increase of regional cerebral blood flow. Most of the functional imaging studies implicitly assume that variability of the hemodynamic response throughout a single day is negligible. To test this assumption we measured brain activation by functional near-infrared spectroscopy (fNIRS) in the visual cortex of ten subjects six times throughout the day, from 0800–1800 h, during an event-related checkerboard paradigm. Concentration of oxygenated hemoglobin increased, whereas concentration of deoxygenated hemoglobin decreased at each time point examined, without significant influences of daytime. Variability of the hemodynamic response was higher across subjects than for single subjects across day. In conclusion, our study is the first one supporting the common practice of ignoring circadian variability in functional imaging studies.

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Language(s): eng - English
 Dates: 2006
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 293228
Other: P7276
DOI: 10.1016/j.ijpsycho.2005.11.003
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Title: International Journal of Psychophysiology
  Other : Int. J. Psychophysiol.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 62 (1) Sequence Number: - Start / End Page: 9 - 13 Identifier: ISSN: 0167-8760
CoNE: https://pure.mpg.de/cone/journals/resource/954925484686