Since the ’90s, brain research has yielded colorful brain images. Today, scanners such as x-ray machines or tomography machines Kernspin-Tomografie provide excellent insights into the processes of brain activity. Owl At Times I Think To Myself Drop The Book. Previously we had only measured electrical currents or individual chemical reactions. These devices now measure blood flow in those areas and give us sophisticated color pictures. For the first time, the Limbic System, the main source of our emotions and feelings, is deciphered.