Rather profound shift in powers of mental focus (not for the good), together with mild respiratory oddness. Assuming it's from the rooms above the Pennsylvania Turnpike, which were quite a shift from the quiet, somewhat swampy city of the Jedi Council. The paradigm for it in my understanding is the beginning of Tarkofski's Solaris -- the earthly home (which we see in the director's ending to be the world of forms), and then this deeply disturbing soundtrack of automobiles and traffic counterbalanced by sedative visuals. From the place of understanding to the difficult work and alienating journey.
Given the preponderance of the visual in experiencing films, people often take the traffic section to be simply soporific and sedative -- but if you listen to the audio on its own, it's actually deeply disturbing.