As to Go Motion, well, Wikipedia is only as good as the people who contribute to it, and those people dropped the ball on this entry, which is citation poor and makes the mistake of conflating various blurring techniques for stop motion under the umbrella of Go Motion, which is actually a very specific technique (rod puppets connected to a motion control rig which moves parts of them while the shutter is open to create blur).
As to 1923's The Voice of the Nightingale, I'm a bit familiar with Ladislas Starévitch's work, being a big fan of his 1912
The Revenge of a Kinematograph Cameraman, and it's not entirely clear what technique he used to create blurs in that the Nightingale film.
[yt]http://www.youtube.com/watch?v=GLJtLc_wVgA[/yt]