Mexican jumping beans exhibit diffusive motion, study finds
random-walkdiffusionbiological-motionphysicsoptimization
Abstraction: Moth larvae move jumping beans via random diffusive walk to find shade
Key points:
- Mexican jumping beans are seed pods containing moth larvae that move to seek cooler shaded spots; failure to find shade leads to larval death
- Study by Devon McKee and Pasha Tabatabai (Seattle University) tracked 37 bean trajectories on a heated surface with infrared thermometers
- Paths are statistically random (diffusive), not directed — equivalent to a random walk
- Random strategy guarantees eventual coverage of all area; a directed strategy only succeeds if aimed correctly, and fails otherwise
- Computer simulations confirmed random paths outperform directed paths in expectation when direction is unknown
- Published in Physical Review E (2023); DOI: 10.1103/PhysRevE.107.014609
Connections: Random Walk · Diffusion Processes
Source: https://phys.org/news/2023-02-mexican-beans-diffusive-motion.html