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Honeybees join humans as the only known animals that can tell the difference between odd and even numbers

Green Hearts by Green Hearts
April 29, 2022
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“Two, four, six, eight; bog in, don’t wait”.

As kids, we be taught numbers can both be even or odd. And there are various methods to classify numbers as even or odd.

We might memorise the rule that numbers ending in 1, 3, 5, 7, or 9 are odd whereas numbers ending in 0, 2, 4, 6, or 8 are even. Or we might divide a quantity by 2 – the place any complete quantity consequence means the quantity is even, in any other case it should be odd.

Similarly, when coping with real-world objects we can use pairing. If we now have an unpaired ingredient left over, that means the variety of objects was odd.

Until now odd and even categorisation, additionally referred to as parity classification, had by no means been proven in non-human animals. In a brand new examine, revealed at this time in the journal Frontiers in Ecology and Evolution, we present honeybees can be taught to do that.

Why is parity categorisation particular?

Parity duties (such as odd and even categorisation) are thought-about summary and high-level numerical ideas in humans.

Interestingly, humans display accuracy, velocity, language and spatial relationship biases when categorising numbers as odd or even. For instance, we have a tendency to reply quicker to even numbers with actions carried out by our proper hand, and to odd numbers with actions carried out by our left hand.

We are additionally quicker, and extra correct, when categorising numbers as even in comparison with odd. And analysis has discovered kids sometimes affiliate the phrase “even” with “right” and “odd” with “left”.

These research counsel humans might have learnt biases and/or innate biases concerning odd and even numbers, which can have arisen both by way of evolution, cultural transmission, or a mixture of each.

It isn’t apparent why parity may be vital past its use in arithmetic, so the origins of those biases stay unclear. Understanding if and how different animals can recognise (or can be taught to recognise) odd and even numbers may tell us extra about our personal historical past with parity.

Training bees to be taught odd and even

Studies have proven honeybees can be taught to order portions, carry out easy addition and subtraction, match symbols with portions and relate dimension and quantity ideas.




Read extra:
Can bees do maths? Yes – new analysis reveals they can add and subtract


To educate bees a parity activity, we separated people into two teams. One was educated to affiliate even numbers with sugar water and odd numbers with a bitter-tasting liquid (quinine). The different group was educated to affiliate odd numbers with sugar water, and even numbers with quinine.

Here we present a honeybee being educated to affiliate ‘even’ stimuli with a reward over 40 coaching decisions.
Scarlett Howard

We educated particular person bees utilizing comparisons of odd versus even numbers (with playing cards presenting 1-10 printed shapes) till they selected the appropriate reply with 80% accuracy.

Remarkably, the respective teams learnt at totally different charges. The bees educated to affiliate odd numbers with sugar water learnt faster. Their studying bias in direction of odd numbers was the reverse of humans, who categorise even numbers extra rapidly.

Honeybee standing on a grey plexiglass paltform ridge drinking a clear liquid (sugar water).
Honeybees landed on a platform to drink sugar water throughout the experiment.
Scarlett Howard

We then examined every bee on new numbers not proven throughout the coaching. Impressively, they categorised the new numbers of 11 or 12 parts as odd or even with an accuracy of about 70%.

Our outcomes confirmed the miniature brains of honeybees have been in a position to perceive the ideas of odd and even. So a big and complicated human mind consisting of 86 billion neurons, and a miniature insect mind with about 960,000 neurons, may each categorise numbers by parity.

Does this imply the parity activity was much less complicated than we’d beforehand thought? To discover the reply, we turned to bio-inspired know-how.

We educated honeybees to decide on even numbers. In this video we see the bee examine every card on the display, earlier than making an accurate selection on the card presenting an even variety of 12 shapes.

Creating a easy synthetic neural community

Artificial neural networks have been one in all the first studying algorithms developed for machine studying. Inspired by organic neurons, these networks are scalable and can deal with complicated recognition and classification duties utilizing propositional logic.

We constructed a easy synthetic neural community with simply 5 neurons to carry out a parity check. We gave the community alerts between 0 and 40 pulses, which it categorized as both odd or even. Despite its simplicity, the neural community appropriately categorised the pulse numbers as odd or even with 100% accuracy.

This confirmed us that in precept parity categorisation doesn’t require a big and complicated mind such as a human’s. However, this doesn’t essentially imply the bees and the easy neural community used the identical mechanism to resolve the activity.

Simple or complicated?

We don’t but understand how the bees have been in a position to carry out the parity activity. Explanations might embody easy or complicated processes. For instance, the bees might have:

  1. paired parts to search out an unpaired ingredient

  2. carried out division calculations – though division has not been beforehand demonstrated by bees

  3. counted every ingredient and then utilized the odd/even categorisation rule to the whole amount.

By educating different animal species to discriminate between odd and even numbers, and carry out different summary arithmetic, we can be taught extra about how maths and summary thought emerged in humans.

Is discovering maths an inevitable consequence of intelligence? Or is maths one way or the other linked to the human mind? Are the variations between humans and different animals lower than we beforehand thought? Perhaps we can glean these mental insights, if only we hear correctly.




Read extra:
How a bee sees: tiny bumps on flower petals give them their intense color — and assist them survive


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