Dr. Penn is MOST likely to use MRI which neuroimaging technique to get a glimpse of his subjects' brains.
Magnetic resonance imaging (MRI) is known to be a tool that is said to provide a scan that makes use of strong magnetic fields and radio waves to create a good and detailed images of the inside of the human body.
Note that Dr. Penn is MOST likely to use MRI which neuroimaging technique to get a glimpse of his subjects' brains.
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