Functional Magnetic Resonance Imaging (fMRI) explained | Neuroscience Methods 101
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- čas přidán 10. 12. 2021
- Functional magnetic resonance imaging, or fMRI, is a neuroimaging method which makes brain scans that show regions with increased brain activity.
With an MRI scanner oxygen properties of blood can be measured. This gives an indication whether a region is rich or poor in oxygen. Since neurons require oxygen after being activated, this so-called blood-oxygenation-level-dependent response, or BOLD response, is a proxy of brain activity.
Blood rich in oxygen, i.e. oxygenated blood, has diamagnetic properties and is slightly repelled within the magnetic field. Deoxygenated blood, which is poor in oxygen, has paramagnetic properties and is slightly attracted by the magnetic field. These differences lead to differences in the MRI signal and reflect activated an less activated regions.
References/Resources:
Huettel, S.A., Song, A.W., McCarthy, G. (2014). Functional Magnetic Resonance Imaging, 3rd edition. Sinauer Associates, Oxford University Press, Oxford, United Kingdom.
Narrated by: Miles Wischnewski
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Very well explained, thank you!!
Thank you!
super video ! Thank you a lot
Thank you for watching!
Hello, I was looking at the video in the hope of understanding what does the colors represent on an fMRI scan. If I understand correctly, the darkest red means more BOLD signal and the darkest blue means less BOLD signal?
In most cases that would be correct, yes. But the color scheme can be set to the researchers liking. Therefore, when you read a paper with figures like these, pay close attention to the legend.
Hello, I am a Korean who also left a comment on your fnirs video. Please understand the use of the translator As I said in the video, I have to research fnirs or fmri for school assignments. But I found you because it was too difficult to find the material. You teach difficult things easily. But I didn't understand what you were saying because I didn't have subtitles. If you don't mind, could you give me a brief summary of fmri? I'm sorry. I want to know how fmri works. I need a summary of your video content. I don't have time, so please reply quickly. I'm really sorry
In short: blood with oxygen is attracted differently by a big magnet compared to blood without oxygen. The MRI scanner is a big magnet, so regions with more oxygen show up differently than regions without oxygen. And since oxygen reflects neural activity, the fMRI picks up regions that are active
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