What technique allows to detect changes in neural activity in the brain by measuring changes in blood oxygenation?

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Functional magnetic resonance imaging (fMRI) allows to detect changes in neural activity in the brain by measuring changes in blood oxygenation. This technique is based on the fact that when a brain region is active, it consumes more oxygen and there is an increase in blood flow to that region, which leads to a change in the blood oxygenation level. By detecting these changes in blood oxygenation, fMRI can create maps of brain activity that reflect which areas of the brain are involved in specific tasks or cognitive processes. Computer tomography (CT) and transcranial direct current stimulation (tDCS) are not used for measuring changes in neural activity in the brain. Electroencephalogram (EEG) can detect changes in electrical activity in the brain, but not changes in blood oxygenation.

What Technique Allows to Detect Changes in Neural Activity in the Brain