 This area of research is based on multiple measurement methods from single cell recordings to multi-regional measurements using functional magnetic resonance imaging (fMRI), electroencephalography (EEG) and magnetoencephalography (MEG).Transcranial magnetic stimulation (TMS) has also been used to temporarily 'lesion' (inactivate) specific regions and so get an indication of the necessity of those regions in processing specific dimensions of the presented stimuli.Much of this research has been focused on the visual domain, however auditory and olfactory processes have also been investigated.