SPONTANEOUS RECRUITMENT AND ANNIHILATION OF DEGREES OF FREEDOM IN BIOLOGICAL COORDINATION

Whereas bifurcations within an already active set of components are we ll-known in biological coordination (e.g. pit transitions), less well understood is the process by which previously quiescent degrees of fre edom are spontaneously activated. We introduce a simple paradigm to ex plore how complex, biological systems flexibly recruit and annihilate degrees of freedom according to parametric task requirements. A sequen ce of transitions within and across planes of motion is observed as a control parameter is varied. Such transitions are invariably preceded by enhancement of fluctuations in trajectory related variables. Our re sults suggest a theoretical model in which the main qualitative change s observed experimentally are a consequence of two consecutive Hopf bi furcations.