User blog comment:Sicarius001/Theory on Flash Step/Sonido Speed and Effects/@comment-13442349-20130726075849

Shunpo/Sonido/Hirenkyaku/Bringer Light are all different forms of "Hyper speed movement". They appear to work in a similar manner to the Shunshin no Jutsu in Naruto.

Shunpo and Sonido are never properly explained; Shunpo is vaguely suggested at the Shinigami simply getting from point A to point B in the shortest amount of time possible, which doesn't allow you to grasp the "How" of Shunpo. Hirenkyaku is riding on the flow of Reishi, and Bringer Light is more or less a manipulation of the medium the Fullbringer is standing on to allow them to move at hyperspeed from point A to point B.

I don't believe these techniques affect perception, but I do believe these techniques affect the speed at which one is moving.