In the past decades, studies of nonlinear systems have produced insights into the behavior of biological systems.3 Nonlinear systems are characterized by the fact that superposition of outputs for each individual input will not generate the final output of the system. Bifurcation theory is a common method for the analysis of nonlinear systems. Bifurcation is an abrupt qualitative change in the behavior of the system. The change may be slight or catastrophic. A parameter value at which a bifurcation occurs is called bifurcation point.4 We hypothesize that the functional state of schizophrenic patients, because of their genetic predisposition, is located in the vicinity of a bifurcation point. In this situation, a moderate stress in life-events may induce a qualitative change in the behavior of the system; that is, bifurcation occurs, and the stability of the system may change. This can be equivalent to the onset of disease or its relapse. It seems that the pharmacological medications try to return the system to its stable state, preserve this stability, and prevent aggravation of the symptoms. In this context, it is important to take advantage of proper behavioral therapies to keep the system more stable when exposed to stressful events.