The idea that humans have wings, tentacles, or an extra arm all seem rather unlikely.
But these scenarios could become reality in the coming decades, thanks to leaps in human augmentation.
Researchers have already designed a “third thumb” controlled by foot movements that would allow the wearer to unscrew a bottle, peel a banana or insert a needle with just one hand.
Now experts believe the thumb is just a first step toward bigger, more dramatic additions to the human body.
Tamar Makin, a professor of cognitive neuroscience at Cambridge University, said the brain’s ability to adapt to an extra limb was “extraordinary.”
The idea that humans have wings (artist’s impression), tentacles or an extra arm all seem rather unlikely. But these scenarios could become reality in the coming decades, thanks to leaps in human augmentation
But scaling up the design to larger augmentation devices comes with its own hurdles.
“The big question is how do you control a body part you’ve never had before?” she said.
“When we work with replacement technology, such as prosthetics, the goal is quite simple.
‘But in addition, I want you to continue to use your body optimally and also give you an extra body part.
“We also worry about what we call the resource redistribution problem — what if I steal resources from the feet to give one to the hands?”
When asked if it would be possible to design wings or even tentacles for human use, Professor Makin said: ‘Yes, technically. The technologies are there, we just need to scale them up.
‘There are technological problems, for example you want it to be portable and comfortable, not to be heavy and not to plug into a socket.
Control is the real problem. So wings are actually very simple because it’s just one degree of freedom – up and down.
“But when you do something more complicated, like a tentacle, we need a lot of control.
“For example, if you want to get to your cup of coffee because it’s far away, you want to use your tentacle.
“But if you really need to concentrate because it’s a really complicated task, then just getting up is less distracting.”
When asked if it would be possible to design wings or even tentacles for human use, Professor Makin said: ‘Yes, technically. The technologies are there, we just need to scale them up’
Researchers have already designed a ‘third thumb’ controlled by foot movements that would allow the wearer to unscrew a bottle, peel a banana or thread a needle with just one hand
Her colleague Dani Clode was the mastermind behind the Third Thumb, which was first revealed in 2017.
The robotic 3D-printed digit is worn on the side of the hand opposite the user’s actual thumb.
The wearer controls it with pressure sensors attached to their feet, on the underside of the big toes, with a wireless link connecting the two.
For their study, 20 participants were trained for five days to use the thumb, for example to pick up several balls or wine glasses with one hand.
They learned the basics of the thumb very quickly and could even use it while distracted or blindfolded.
In the journal Science Robotics, the team writes that participants also increasingly feel that the thumb is part of their own body.
The robotic 3D-printed digit is worn on the side of the hand opposite the user’s actual thumb
Before and after the training, the researchers scanned the participants’ brains. They discovered subtle but significant changes in the organization of neural circuits that light up when we use our hands.
Professor Makin said: ‘Evolution has not prepared us to use an extra body part, and we have found that in order to expand our capabilities in new and unexpected ways, the brain has to adapt the representation of the biological body.’
Ms. Clode has also designed a robotic, retractable tentacle that acts as a prosthetic arm.
Dubbed ‘Vine 2.0’, it has 26 individual vertebrae that are controlled by the wearer using pressure sensors and electronics in shoes.
Silvestro Micera, of the Sant’Anna School of Advanced studies in Pisa, is also working on a third arm that will be attached to the body around the waist and controlled by breathing.
The researchers will discuss their advances in augmentation at the annual conference of the American Association for the Advancement of Science in Washington.
Implants that allow bionic arms to be operated only by THOUGHT will be available in Europe within two years
Three people in Sweden are using an implant system that allows amputees to use a bionic arm using only their thoughts. Dr. Max Ortiz Cataln of Chalmers University of Technology hopes the technology can be expanded to Europe. The implant system anchors the prosthesis to the skeleton in the stump of the amputated limb
According to Swedish researchers, amputees could use bionic arms with nothing but their thoughts within two years.
An implant system is already available in Sweden that allows the use of a bionic arm without the need for supporting equipment.
Now the team behind it is working to get European certification to help more people.
Three Swedes who have had an amputation use the technology, which can be connected to any arm prosthesis on the market.
Dr. Max Ortiz Catalan, an associate professor at Chalmers University of Technology in Sweden, said their prosthesis could be a clinically viable replacement for a lost arm.
He told the PA news agency: “People in Sweden can now have this technology.
“We were ramping up production before the pandemic started.
“We are aiming to get it CE marked soon, within two years, and once it is CE marked, it could be available as a product in Europe.”
Two of the three patients involved in their clinical trial have been using their bionic arms for about three years, while the third participant has been using their artificial limb for seven years.
A new functionality – the sensation of touch – has recently been added to all three prosthetic arms.
Dr. Ortiz Catalan said the implant system, which anchors the prosthesis to the skeleton in the stump of the amputated limb, is stable and can be used for long periods of time without intervention from the scientists.
He said: ‘The real breakthrough here is that this neuromusculoskeletal interface, as we call it, makes it possible to connect the artificial limb to the body.
‘And if you have that intimate connection between technology and biology, you can steer better and receive sensory feedback.’