Many animation techniques were used and experimented with in this film.
"Sensology is a short animated film by Michel Gagné that visualizes in abstract form, an improvised musical session by two leaders of the avant-guarde jazz movement, Paul Plimley (piano) and Barry Guy (bass). The film was started in August 2006 and completed in July 2010.
Sensology was handdrawn (painted) with a Wacon tablet at first, and later, a Cintiq, using Adobe Photoshop. The drawings and frames were then composited and manipulated in a 2D software called Animo. There is no vector animation at any point in the film."
Source youtube description: http://www.youtube.com/watch?v=UVWKtXDvr04