Evidence of spatio-temporal transition to chaos in the spine

In this paper we analyze sEMG signals collected during a procedure in which a traveling, and ultimately a standing wave is induced along the spine. In particular, we used the recently proposed method called the zero-one test. Using this binary test, we show that the dynamics at the sacrum of the spine is not chaotic while the dynamics transitions to chaos along the spine to the cervix. Further more, the test reveals certain interesting dynamical systems properties that are discussed.