Donnerstag, 11. April 2013
Gehirn: Wellenausbreitung über den gesamten Kortex
klauslange,19:15h
Die Neurowissenschaft ordnet bestimmten Aktivitäten einem bestimmten Gebiet im Gehirn zu. Diese Sichtweise greift aber viel zu kurz, wie nun Forscher herausfanden. Vielmehr breitet sich über das gesamte Gehirn, von einer Seite zur anderen, eine Welle an Aktivitäten aus, die auch bei Wiederholungen ein und derselben Handlung andere Wellenmuster hervorruft.
Dies berichtet science daily:
"We are examining the activity in the cerebral cortex as a whole. The brain is a non-stop, always-active system. When we perceive something, the information does not end up in a specific part of our brain. Rather, it is added to the brain's existing activity. If we measure the electrochemical activity of the whole cortex, we find wave-like patterns. This shows that brain activity is not local but rather that activity constantly moves from one part of the brain to another. The local activity in the Brodmann areas only appears when you average over many such waves.”
Journal Reference:
David M. Alexander, Peter Jurica, Chris Trengove, Andrey R. Nikolaev, Sergei Gepshtein, Mikhail Zvyagintsev, Klaus Mathiak, Andreas Schulze-Bonhage, Johanna Ruescher, Tonio Ball, Cees van Leeuwen. Traveling waves and trial averaging: The nature of single-trial and averaged brain responses in large-scale cortical signals. NeuroImage, 2013; 73: 95 DOI: 10.1016/j.neuroimage.2013.01.016
Dies berichtet science daily:
"We are examining the activity in the cerebral cortex as a whole. The brain is a non-stop, always-active system. When we perceive something, the information does not end up in a specific part of our brain. Rather, it is added to the brain's existing activity. If we measure the electrochemical activity of the whole cortex, we find wave-like patterns. This shows that brain activity is not local but rather that activity constantly moves from one part of the brain to another. The local activity in the Brodmann areas only appears when you average over many such waves.”
Journal Reference:
David M. Alexander, Peter Jurica, Chris Trengove, Andrey R. Nikolaev, Sergei Gepshtein, Mikhail Zvyagintsev, Klaus Mathiak, Andreas Schulze-Bonhage, Johanna Ruescher, Tonio Ball, Cees van Leeuwen. Traveling waves and trial averaging: The nature of single-trial and averaged brain responses in large-scale cortical signals. NeuroImage, 2013; 73: 95 DOI: 10.1016/j.neuroimage.2013.01.016
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