From the perspective of nonlinear science, it is argued that one may accept physicalism and reject substance dualism without being forced into reductionism. This permits a property dualism under which biological and mental phenomena may emerge from intricate positive feedback networks, involving many levels of both the biological and cognitive hierarchies.

It is well known that physical exercise requires the coordinated function of the heart, lungs and peripheral and pulmonary circulation to support the increased demands of contracting muscles. This evidence is well represented by the so-called Wasserman’s gears representing the functional interdependence of the physiological components of the system and the mechanisms for coupling internal (i.e....