Buzz
Two researchers from the University of Regensburg in Germany have conducted a study suggesting that ants can recognize when they lack knowledge and respond with uncertainty.
Ant colonies usually collaborate by depositing pheromone trails to guide others to food sources. However, Tomer Czaczkes and Jürgen Heinze discovered that when test ants faced unpredictable conditions, they were less inclined to mark paths for their fellow ants.
In the experiment, black garden ants were trained to locate food in a T-shaped maze. Initially, the food was always placed in one section of the maze. After the researchers moved the food to the opposite section, ants heading to the now-empty area were less likely to leave pheromone trails.
"It makes sense," explains Czaczkes. "Providing incorrect information to your fellow ants would be counterproductive."
After rediscovering the food, the ants reinforced their pheromone trails more intensely on their return to the colony, likely to correct the earlier misleading signals. However, the most notable observation was that ants exploring the now-empty section of the maze refrained from leaving any pheromone trails at all.
"Even after locating the new food source once, the ants often remained uncertain, still favoring the old location," Czaczkes notes.
This capacity to distinguish between certain and uncertain information suggests a form of metacognition not previously observed in insects (aside from bees). However, some experts remain skeptical.
"Ants might be driven by other motivations, such as exploration, which could reduce their pheromone deposition," suggests Ken Cheng from Macquarie University in Sydney, Australia. Joachim Zeil of the Australian National University proposes that the behavior might simply be a statistical outlier.
The researchers involved in the study are confident in their findings. "While we haven't yet found definitive evidence of metacognition in ants, we are determined to uncover it," states Czaczkes.
