The main functioning, properties and features, including advantages and limits, of Positron Emission Tomography {(PET)}, functional Magnetic Resonance Imaging {(fMRI)}, Electroencephalography {(EEG)}, Magnetoencephalography {(MEG)}, and Transcranial Stimulation {(TMS} and {tDCS)} will be discussed.}, Url = {http://ideas.repec.org/a/cai/repdal/redp_181_0097.html}