In a discovery that may prove important for cognitive science, our understanding of nature and applications for robot vision, researchers at the University of Adelaide have found evidence that the dragonfly is capable of higher-level thought processes when hunting its prey.
The discovery, to be published online today in the journal Current Biology, is the first evidence that an invertebrate animal has brain cells for selective attention, which has so far only been demonstrated in primates.
Dr Steven Wiederman and Associate Professor David O'Carroll from the University of Adelaide's Centre for Neuroscience Research have been studying insect vision for many years.
Using a tiny glass probe with a tip that is only 60 nanometers wide - 1500 times smaller than the width of a human hair - the researchers have discovered neuron activity in the dragonfly's brain that enables this selective attention.
They found that when presented with more than one visual target, the dragonfly brain cell 'locks on' to one target and behaves as if the other targets don't exist.
"Selective attention is fundamental to humans' ability to select and respond to one sensory stimulus in the presence of distractions," Dr Wiederman says.
"Imagine a tennis player having to pick out a small ball from the crowd when it's traveling at almost 200kms an hour - you need selective attention in order to hit that ball back into play.
"Precisely how this works in biological brains remains poorly understood, and this has been a hot topic in neuroscience in recent years," he says.
"The dragonfly hunts for other insects, and these might be part of a swarm - they're all tiny moving objects. Once the dragonfly has selected a target, its neuron activity filters out all other potential prey. The dragonfly then swoops in on its prey - they get it right 97% of the time."Associate Professor O'Carroll says this brain activity makes the dragonfly a more efficient and effective predator.
"What's exciting for us is that this is the first direct demonstration of something akin to selective attention in humans shown at the single neuron level in an invertebrate," Associate Professor O'Carroll says.
"Recent studies reveal similar mechanisms at work in the primate brain, but you might expect it there. We weren't expecting to find something so sophisticated in lowly insects from a group that's been around for 325 million years.
"We believe our work will appeal to neuroscientists and engineers alike. For example, it could be used as a model system for robotic vision. Because the insect brain is simple and accessible, future work may allow us to fully understand the underlying network of neurons and copy it into intelligent robots," he says.
University of Adelaide: http://www.adelaide.edu.au
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
Is that a giant tooth on your head or are you just happy to see me?
Mother deer rushed towards the infant distress calls of seals, humans and even bats, suggesting that these mammals share similar emotions
In the forests of eastern Australia, a squadron of social spiders faces off against an army of the world's most dangerous ants in a pitched battle for survival
Contrary to some earlier projections, the world's population will soar through the end of the 21st century thanks largely to sub-Saharan Africa's higher-than-expected birth rates, United Nations and other population experts said on Thursday.
Archaeologists got to the root of an ancient hairstyle when they unearthed a 3,300-year-old body with 70 hair extensions
A major international study finds that killings among chimpanzees result from normal competition, not human interference.
Clownfish travel hundreds of kilometres, but it is the larvae rather than the adults that migrate
U.S. government researchers working with divers and sonar equipment have located the wrecks of what they dubbed "forgotten ghost ships" in waters just outside San Francisco's Golden Gate strait.
"It's spooky," a Clearwater, Fla., fisherman said, comparing the toxic algae bloom to "boiled red Georgia clay"
Physicist Danielle Bassett has been awarded a MacArthur Fellowship based on her work studying the human brain. She talks with Melissa Block about the advances it may lead to.