Bees Have Brains for Basic Maths: Study

RMIT University By Gosia Kaszubska February 7, 2019

Researchers have found bees can do basic mathematics, in a discovery that expands our understanding of the relationship between brain size and brain power.

Building on their finding that honeybees can understand the concept of zero, Australian and French researchers set out to test whether bees could perform arithmetic operations like addition and subtraction.

Solving maths problems requires a sophisticated level of cognition, involving the complex mental management of numbers, long-term rules and short term working memory.

The revelation that even the miniature brain of a honeybee can grasp basic mathematical operations has implications for the future development of Artificial Intelligence, particularly in improving rapid learning.

Led by researchers from RMIT University in Melbourne, Australia, the new study showed bees can be taught to recognise colours as symbolic representations for addition and subtraction, and that they can use this information to solve arithmetic problems.

RMIT’s Associate Professor Adrian Dyer said numerical operations like addition and subtraction are complex because they require two levels of processing.

“You need to be able to hold the rules around adding and subtracting in your long-term memory, while mentally manipulating a set of given numbers in your short-term memory,” Dyer said.

“On top of this, our bees also used their short-term memories to solve arithmetic problems, as they learned to recognise plus or minus as abstract concepts rather than being given visual aids.

“Our findings suggest that advanced numerical cognition may be found much more widely in nature among non-human animals than previously suspected.

“If maths doesn’t require a massive brain, there might also be new ways for us to incorporate interactions of both long-term rules and working memory into designs to improve rapid AI learning of new problems.”

There is considerable debate around whether animals know or can learn complex number skills.

Many species can understand the difference between quantities and use this to forage, make decisions and solve problems. But numerical cognition, such as exact number and arithmetic operations, requires a more sophisticated level of processing.

Previous studies have shown some primates, birds, babies and even spiders can add and/or subtract. The new research, published today in Science Advances, adds bees to that list. 

A school for bees? How the honeybees were trained

The experiment, conducted by PhD researcher Scarlett Howard in the Bio Inspired Digital Sensing-Lab (BIDS-Lab) at RMIT, involved training individual honeybees to visit a Y-shaped maze.

The bees received a reward of sugar water when they made a correct choice in the maze, and received a bitter-tasting quinine solution if the choice was incorrect.

Honeybees will go back to a place if the location provides a good source of food, so the bees returned repeatedly to the experimental set-up to collect nutrition and continue learning.

When a bee flew into the entrance of the maze they would see a set of elements, between 1 to 5 shapes. The shapes were either blue, which meant the bee had to add, or yellow, which meant the bee had to subtract.

After viewing the initial number, the bee would fly through a hole into a decision chamber where it could choose to fly to the left or right side of the maze.

One side had an incorrect solution to the problem and the other side had the correct solution of either plus or minus one. The correct answer was changed randomly throughout the experiment to avoid bees learning to visit just one side of the maze.

At the beginning of the experiment, bees made random choices until they could work out how to solve the problem. Eventually, over 100 learning trials that took 4 to 7 hours, bees learned that blue meant +1, while yellow meant -1. The bees could then apply the rules to new numbers.

Scarlett Howard said the ability to do basic maths has been vital in the flourishing of human societies historically, with evidence that the Egyptians and Babylonians used arithmetic around 2000BC.

“These days, we learn as children that a plus symbol means you need to add two or more quantities, while a minus symbol means you subtract,” she said.

“Our findings show that the complex understanding of maths symbols as a language is something that many brains can probably achieve, and helps explain how many human cultures independently developed numeracy skills.”

The research, with collaborators from University of Toulouse and the ARC Centre of Excellence for Nanoscale Biophotonics at RMIT, is published today ("Numerical cognition in honeybees enables addition and subtraction", Science Advances, DOI 10.1126/sciadv.aav0961).

Video: Kiralee Greenhalgh

Clever Bee-Brain Lets the Insects See the Big Picture

The Sydney Morning Herald/The Age     By Bridie Smith    December 8, 2014
The bees have it: associate professor Adrian Dyer says the discovery is a rethink of how brains process information.
The bees have it: associate professor Adrian Dyer says the discovery
is a rethink of how brains process information. Photo: Simon O'Dwyer

Having a bee-brain isn't such a bad thing, as it turns out. Australian and French scientists have found that the insect is the only species other than humans capable of seeing the big picture as well as the detail in their environment.

Essentially the findings show the humble honey bee can see both the forest and the trees, a skill which not even primates can boast.

Published in the journal Proceedings of the Royal Society B, the results have implications for artificial intelligence.

Associate Professor Adrian Dyer with his honeybees at Melbourne University.
Associate Professor Adrian Dyer with his honeybees at Melbourne University. Photo: Simon O'Dwyer

"This is a complete change in our thinking of how brains process visual information," said associate professor Adrian Dyer from RMIT University, a co-author of the paper.

With under 1 million neurons, a bee's brain has less neurons than a human retina. But Professor Dyer said this made it the perfect model for studying information processing at its most basic level.

"In the 1970s we saw (Star Wars robot) C-3P0 walking around and interacting with very complex things," Professor Dyer said. "But the reality is that if we think of where robots have come in the last 20, 30 or 40 years it is remarkably disappointing."

What has been holding things back is working out how to enable robots to process the complex visual information in their environment.

"Machine vision is capable of seeing the local information, or the trees, but it can't stitch it together properly to see the global information, or the forest, to know how to interact with the environment," Professor Dyer said.

Conducted over four years, the honeybee study provides great insights into the minimal neural requirements for global processing. It also proves high-level cortical processing isn't essential, meaning that the bee-brain could be a model replicated artificially.

To study the way the honeybee processes visual cues in their environment, researchers from RMIT, Monash University and the University of Toulouse watched as individual bees were released in a Y-shaped maze.

After travelling up the stem and reaching the intersection, the bees were faced with a choice of pattern at the end of each corridor. Each pattern contained both global information (from a distance the pattern formed a square or triangle) and local information (shapes within the pattern were circles and diamonds).

In subsequent tests, patterns were changed so that local and global information was swapped. The results showed the bees returned the patterns with the original global information.

It's not the first time the bee brain has proved more adept than its size might suggest. A decade ago, experiments showed bees could recognise faces. Bees, when rewarded, have also been shown to be able to learn tasks in a matter of hours.