Bees understand the concept of zero

New research suggests that honeybees can rank numerical quantities and understand that zero belongs at the lower end of a sequence of numbers.

Zero is a difficult concept to understand and a mathematical skill that doesn’t come easily – it takes children a few years to learn. We’ve long believed only humans had the intelligence to get the concept, but recent research has shown monkeys and birds have the brains for it as well. What we haven’t known – until now – is whether insects can also understand zero.

Previous research has shown that honeybeees can learn intricate skills from other bees and even understand abstract concepts such as sameness and difference. But bee brains have fewer than 1 million neurons – compared with the 86,000 million neurons of a human brain – and little was known about how insect brains would cope with being tested on such an important numeric skill.

Trained to pick the lowest number out of a series of options, a honeybee chooses a blank image, revealing an understanding of the concept of zero.

To test the bees, the researchers trained bees to choose an image with the lowest number of elements in order to receive a reward of sugar solution. For example, the bees learned to choose three elements when presented with three vs. four; or two elements when presented with two vs. three. When the researchers periodically tested the bees with an image that contained no elements versus an image that had one or more, the bees understood that the set of zero was the lower number – despite never having been exposed to an “empty set.”

This is a tricky neuroscience problem. It is relatively easy for neurons to respond to stimuli such as light or the presence of an object but how do we, or even an insect, understand what nothing is? How does a brain represent nothing? Could bees and other animals that collect lots of food items, have evolved special neural mechanisms to enable the perception of zero?

If bees can learn such a seemingly advanced math skill that we don’t even find in some ancient human cultures, perhaps this opens the door to considering the mechanism that allows animals and ourselves to understand the concept of nothing.

Crossing a road is simple for adult humans. We understand if there are no approaching cars, no bikes or trams, then it is probably OK to cross. But what is zero, how do we represent this for so many complex object classes to make decisions in complex environments? If bees can perceive zero with a brain of less than a million neurons, it suggests there are simple efficient ways to teach AI new tricks.

Source - EarthSky.org

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