Synchronized Hearts, Desynchronized Brains: A Nonlinear Dynamics Perspective for Function and Failure
Both the heart and the brain are built from electrically excitable cells, yet the emergent dynamics of these organs could not differ more. In the myocardium, a coherent traveling wave of action potentials ensures coordinated contraction; in the cerebral cortex, distributed, irregular spiking underlies efficient information processing and the generation of behavior. Here, we illuminate the principles that underlie the emergence of such distinct nonlinear dynamics using concepts from complex systems. We trace these principles across scales from ion channels and cellular action potential generation, through cellular coupling mechanisms and network architecture, to organ level dynamics and clinical phenotypes. Designed to support either synchronized waves or desynchronized information processing, the heart and the brain can thus be understood as operating on opposite sides of a synchronization phase transition. Crossing this transition implies pathological dynamics in both organs: Loss of synchrony in the heart produces arrhythmia; excess synchrony in the brain leads to epileptic seizures. We discuss how adaptation mechanisms, including plasticity, modulation, remodeling, and learning, maintain the appropriate level of (de)synchronization. Overall, we provide a unified excitable-system perspective, together with an educational notebook, to foster cross-disciplinary insights into cardiac and neural function and pathology.