Crows Make Visual Decisions Twice as Fast as Humans, Study Finds

Researchers at the University of Tübingen have found that crows can make visual decisions twice as quickly as humans and monkeys, according to a study published in the journal Science.

In experiments involving two carrion crows, the birds needed an average of just 235 milliseconds to determine which way a pattern of moving dots was traveling and respond with their choice. Despite their remarkable speed, they remained highly accurate.

To test the birds' decision-making abilities, the researchers presented them with moving dots on a touchscreen. The crows had to determine whether most of the dots were traveling left or right, then indicate their answer by pecking a target on the corresponding side of the screen.

"Even when the patterns of motion were hard to recognize, the crows' decisions were still better than random choices," Philipp Schmidbauer reports, "and with clear signals, they achieved an accuracy of nearly 100 percent."

The researchers examined the activity of individual neurons as the birds completed the task. They recorded neural activity in a part of the bird brain called the nidopallium caudolaterale, which plays an important role in processing information and making decisions, much like the prefrontal cortex in the human brain.

The recordings revealed that the crows' brains began distinguishing between the two possible directions almost immediately. Just 70 milliseconds after the moving dots appeared, neurons associated with the different choices were already showing distinct patterns of activity.

"These findings show that neuronal dynamics in the avian brain are consistent with established models of decision-making in humans and non-human primates," says Andreas Nieder.

Unlike mammals, birds do not have a cerebral cortex organized into layers. Nevertheless, their brains appear capable of following the same fundamental principles for evaluating evidence and reaching decisions. In this visual task, the crows completed that process twice as quickly as primates.

The researchers suggest that this exceptional speed could reflect the demands birds have faced throughout their evolution. Rapidly interpreting visual information and responding with precise movements are especially important for animals that fly and use their beaks to interact with their surroundings.

"Birds rely on their vision to carry out precise, rapid maneuvers during flight and to guide their beaks towards objects when foraging," Nieder explains.

However, the exact biological mechanisms responsible for the crows' speed advantage remain unknown. Further studies will be needed to determine how their differently structured brains can make comparable visual decisions so much faster than those of humans and monkeys.

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