Question

select all the brain-scanning techniques used by investigators to study the internal workings of the brain.

☐ pet

☐ tms

☐ fmri

☐ eeg

☐ x-ray

Explanation:

• PET (Positron Emission Tomography): Uses radioactive tracers to show brain activity and metabolism, helping study internal brain workings.
• TMS (Transcranial Magnetic Stimulation): Is a non - scanning technique that modulates brain activity, not a scanning technique for studying internal brain structure/function in the scanning sense, so it's excluded.
• fMRI (functional Magnetic Resonance Imaging): Measures blood flow changes to map brain activity, used to study brain function.
• EEG (Electroencephalogram): Records electrical activity of the brain, useful for studying brain function.
• X - ray: Primarily used for imaging bones and dense tissues, not effective for studying the internal workings of the brain (like function or soft - tissue - based activity).

Answer:

A. PET, C. fMRI, D. EEG