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Published on: January 7, 2019
Neurovascular coupling in the human somatosensory cortex: a single trial study
Mitsuru Kikuchi1, Kiyomi Shitamichi, Sanae Ueno
1Department of Psychiatry and Neurobiology, Graduate School of Medical Science, Kanazawa University, Kanazawa, Japan. mitsuru@zc4.so-net.ne.jp
Neuroreport
|April 9, 2011
Summary
This study reveals that brain hemodynamic changes closely follow neural oscillations in the beta and gamma bands, with a delay of several seconds. This neurovascular coupling was observed in humans using noninvasive brain imaging techniques.
Area of Science:
- Neuroscience
- Biophysics
- Medical Imaging
Background:
- Higher frequency brain oscillations are linked to regional hemodynamic changes.
- Understanding neurovascular coupling is crucial for interpreting brain activity.
- Electrical nerve stimulation is a tool to probe somatosensory pathways.
Purpose of the Study:
- To investigate neurovascular coupling in humans.
- To examine the relationship between neural oscillations and hemodynamic changes.
- To determine the temporal dynamics of this coupling during somatosensory stimulation.
Main Methods:
- Simultaneous recording of hemodynamic fluctuations using near-infrared spectroscopy (NIRS).
- Simultaneous recording of brain neuronal oscillations using whole-head magnetoencephalography (MEG).
- Single-trial analysis of data from six healthy volunteers during electrical median nerve stimulation.
Main Results:
- Neural fluctuations in the beta (β) and gamma (γ) bands were correlated with hemodynamic fluctuations.
- These correlations exhibited a significant time delay, typically between 5-7 seconds.
- The findings demonstrate a clear temporal lag between neural activity and hemodynamic response.
Conclusions:
- Provides direct, noninvasive evidence of hemodynamic onset lagging specific neural oscillations in humans.
- Highlights the seconds-scale temporal dynamics of neurovascular coupling in awake individuals.
- Supports the understanding of how brain activity is reflected in blood flow changes.
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