ISRD Simulations
Systems you can run
Interactive models of feedback, emergence, chaos, network spread and regulatory capture. Change a parameter and watch the system respond.
Post-Viral Syndrome Outbreak
Agent-based population simulation tracking viral outbreak and post-viral ME/CFS conversion across 100 individuals. 25+ calibrated risk factors, brainstem ANS dynamics, YOU character.
Run it →InteractiveThe Latched Loop
A closed feedback loop can settle into two different stable states — and the pressure needed to enter the unhealthy one is lower than the pressure needed to leave it. Models the bistable regulatory-capture mechanism proposed in an ME/CFS hypothesis.
Run it →In DevelopmentThe Privileged Node
Four biological pacemakers keep the body's rhythms in sync. Three are entrained peers — one has a voluntary override door, a body-wide diffusible output, and a direct limbic connection the others lack. Why that structural asymmetry matters.
Run it →InteractiveEmergence / Flocking
Each agent follows three simple local rules — avoid, align, cohere. No agent sees the global pattern. The flock emerges from purely local interactions.
Run it →InteractiveFeedback Loops
Reinforcing loops amplify change. Balancing loops resist change and seek equilibrium. Most complex systems are networks of both.
Run it →InteractiveLorenz Attractor
Three linked differential equations produce a trajectory that never repeats yet stays bounded. Tiny differences in starting position lead to completely different futures.
Run it →InteractiveNetwork Diffusion
A contagion spreads through a small-world network. Hubs drive early cascades; local clusters slow saturation. Network topology — not transmission rate alone — determines the shape of spread.
Run it →InteractiveBackroom Dynamics
Two networks overlay the same population: the formal hierarchy and the informal relationship layer. A decision cascades through both — the informal network redistributes influence in ways the org chart cannot predict.
Run it →Systems games are the next step: these models grow into scenarios you play.