41. Which one of the following statement is correct?
(A) Functional imaging techniques applied for the study of pain are positron emissiontomography (PET), functional magnetic resonance imaging (fMRI), near-infrared spectroscopy(NIRS), multi-channel electroencephalography (EEG) and magnetoencephalography (MEG),and intracranial recordings.
(B) NIRS is an optical approach that also analyses changes in hemoglobin oxygenation levels byusing light in the near infrared range (650 to 950 nm).
(C) EEG and MEG are noninvasive neurophysiologic techniques that measure the respectiveelectrical potentials and magnetic fields generated by neuronal activity of the brain andpropagated to the surface of the skull where they are picked up with EEG electrodes or,in the case of its magnetic counterpart, received by supra conducting quantuminterference device (SQUID) sensors located outside the skull.
(D) (D.) Invasive recordings, which are assessed during neurosurgical interventions inpatients ongoing epileptic surgery, or deep brain stimulation (DBS) procedures (most commonin Parkinson disease), are extremely helpful to directly measure supraspinal pain signals.
(E) All of the above are correct.