Brain computer interfaces and brain imaging

3 important questions on Brain computer interfaces and brain imaging

What leads to the measurable activity that is seen on an FMRI?

Stimulating the brain-> neuron needs energy which gets it from oxygenated hemoglobin in the blood

How come brain activity induces a magnetic field?

Hemoglobin has magnetic properties, which change with oxygenation level

What is the most severe limitations of fmri?

The speed of the signal, it takes a few seconds after neuronal activity to get the fresh blood supply needed

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