Answer: Will most likely use an fMRI.
fMRI is an acronym for functional magnetic resonance imaging.
The functional magnetic resonance imaging is a type of Magnetic resonance imaging that uses magnetic fields to study activities in part/parts of the brain by looking at changes in blood flow in the brain.
This technique was developed by Seiji Ogawa in 1990.
This method is effective and efficient as it does not require ionising radiation, surgery or any hazardous procedure.