Slime molds, particularly the well-studied Physarum polycephalum, exhibit intriguing behaviours that mimic intelligence despite lacking brains or nervous systems. Recent research indicates that a decentralized decision-making process governs their collective movement, challenging assumptions about central control in living organisms.
This vibrant yellow slime mold, primarily composed of a mass of cell nuclei, displays remarkable adaptability. When it exhausts available food sources, it can navigate to new locations, a feature that distinguishes it from traditional fungi. The study highlights how slime molds not only seek food but also demonstrate problem-solving abilities, such as navigating mazes to locate sustenance.
Researchers from Germany and the United States explored the mechanics behind these behaviours. They noted that P. polycephalum reacts to blue light with a strong aversion, using light traps to study its escape response. These traps consist of regions illuminated by 470 nm blue light, shaping the environment in which the molds find themselves.
During experimentation, starved slime molds began to explore these traps within an hour. They used a process known as cytoplasmic streaming, where cellular fluid flows through their bodies, enabling them to extend small structures into the illuminated regions, searching for escape routes. Most attempts were retracted, but some successful extensions allowed for liberation.
The research revealed that the longest escape routes were preferred, as the mold’s rhythmic contractions helped build pressure along these paths. This mechanical advantage enables efficient movement, suggesting that decision-making in slime molds relies more on fluid dynamics than cognitive processes.
The findings, which uncover the adaptive behaviours of non-neuronal organisms, have been published in PRX Life. Future studies may further elucidate how these fascinating creatures process their environments to survive.
Test Your Understanding
How much do you know?
