Regulation of oxygen transport during brain activation: stimulus-induced hemodynamic responses in human and animal cortices View Full Text


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Article Info

DATE

2003-12-20

AUTHORS

Akitoshi Seiyama, Junji Seki, Hiroki C Tanabe, Yasuhiro Ooi, Yasuhiko Satomura, Hisao Fujisaki, Toshio Yanagida

ABSTRACT

BackgroundThe correlation between regional changes in neuronal activity and changes in hemodynamics is a major issue for noninvasive neuroimaging techniques such as functional magnetic resonance imaging (fMRI) and near-infrared optical imaging (NIOI). A tight coupling of these changes has been assumed to elucidate brain function from data obtained with those techniques. In the present study, we investigated the relationship between neuronal activity and hemodynamic responses in the occipital cortex of humans during visual stimulation and in the somatosensory cortex of rats during peripheral nerve stimulation.MethodsThe temporal frequency dependence of macroscopic hemodynamic responses on visual stimuli was investigated in the occipital cortex of humans by simultaneous measurements made using fMRI and NIOI. The stimulus-intensity dependence of both microscopic hemodynamic changes and changes in neuronal activity in response to peripheral nerve stimulation was investigated in animal models by analyzing membrane potential (fluorescence), hemodynamic parameters (visible spectra and laser-Doppler flowmetry), and vessel diameter (image analyzer).ResultsAbove a certain level of stimulus-intensity, increases in regional cerebral blood flow (rCBF) were accompanied by a decrease in regional cerebral blood volume (rCBV), i.e., dissociation of rCBF and rCBV responses occurred in both the human and animal experiments. Furthermore, the animal experiments revealed that the distribution of increased rCBF and O2 spread well beyond the area of neuronal activation, and that the increases showed saturation in the activated area.ConclusionsThese results suggest that above a certain level of neuronal activity, a regulatory mechanism between regional cerebral blood flow (rCBF) and rCBV acts to prevent excess O2 inflow into the focally activated area. More... »

PAGES

6

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http://scigraph.springernature.com/pub.10.1186/1476-5918-2-6

DOI

http://dx.doi.org/10.1186/1476-5918-2-6

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https://app.dimensions.ai/details/publication/pub.1024097327

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/14687423


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