Skip to main content
Accessibility|Contact|Privacy|Terms of Service

Creating Phantom Sensation in Non-amputees

  • Published: 2013-04-15 : Author: Karolinska Institutet
  • Synopsis: The experience of phantom limbs is not unique to amputated individuals and can easily be created in non-amputees.

Main Document

"Our results show that the sight of a physical hand is remarkably unimportant to the brain for creating the experience of one's physical self"

Scientists create phantom sensations in non-amputees.

The sensation of having a physical body is not as self-evident as one might think. Almost everyone who has had an arm or leg amputated experiences a phantom limb: a vivid sensation that the missing limb is still present. A new study by neuroscientists at the Karolinska Institutet in Sweden shows that it is possible to evoke the illusion of having a phantom hand in non-amputated individuals.

In an article in the scientific periodical Journal of Cognitive Neuroscience, the researchers describe a perceptual illusion in which healthy volunteers experience having an invisible hand. The experiment involves the participant sitting at a table with their right arm hidden from their view behind a screen. To evoke the illusion, the scientist touches the right hand of the participant with a small paintbrush while imitating the exact movements with another paintbrush in mid-air within full view of the participant.

"We discovered that most participants, within less than a minute, transfer the sensation of touch to the region of empty space where they see the paintbrush move, and experience an invisible hand in that position," says Arvid Guterstam, lead author of the study. "Previous research has shown that non-bodily objects, such as a block of wood, cannot be experienced as one's own hand, so we were extremely surprised to find that the brain can accept an invisible hand as part of the body."

The study comprises eleven experiments that explore in detail the illusory experience and include 234 volunteers. To demonstrate that the illusion actually worked, the researchers would make a stabbing motion with a knife towards the empty space "occupied" by the invisible hand and measure the participant's sweat response to the perceived threat. They found that the participants' stress responses were elevated while experiencing the illusion but absent when the illusion was broken. In another experiment, the volunteers were asked to close their eyes and quickly point with their left hand to their right hand (or to where they perceived it to be). After having experienced the illusion for a while, they would point to the location of the invisible hand rather than to their real hand.

The researchers also measured the brain activity of the participants using functional magnetic resonance imaging (fMRI). Perceiving the invisible hand illusion led to increased activity in the same parts of the brain that are normally active when individuals see their real hand being touched or when participants experience a prosthetic hand as their own.

"Taken together, our results show that the sight of a physical hand is remarkably unimportant to the brain for creating the experience of one's physical self," says Arvid Guterstam.

The researchers hope that the results of their study will offer insight into future research on phantom pain in amputees.

"This illusion suggests that the experience of phantom limbs is not unique to amputated individuals, but can easily be created in non-amputees," says the principal investigator, Dr. Henrik Ehrsson, docent at the Department of Neuroscience. "These results add to our understanding of how phantom sensations are produced by the brain, which can contribute to future research on alleviating phantom pain in amputees."

The study was funded by the European Research Council, the Swedish Foundation for Strategic Research, the Human Frontier Science Program, the McDonnell Foundation, and Saderbergska Stiftelsen.

Publication: 'The invisible hand illusion: Multi-sensory integration leads to the embodiment of a discrete volume of empty space', Journal of Cognitive Neuroscience, Arvid Guterstam, Giovanni Gentile & Henrik Ehrsson, online 11 April 2013.

Similar Topics

1 : Students Create 3D Printed Robot Prosthetic Limb for Amputees : University of Manchester.
2 : New Wearable Technology May Hold Big Benefits for People With Parkinson's Disease : University of Western Ontario.
3 : Prosthetic Limbs Represented Like Hands in Brain : University College London.
4 : Amputees Can Learn to Control Robotic Arm with Mind Power : University of Chicago Medical Center.
5 : Working with Smart Materials to Make Prosthetic Limbs More Lifelike : University of Houston.
From our Prostheses and Prosthetics section - Full List (65 Items)


Submit disability news, coming events, as well as assistive technology product news and reviews.


Loan Information for low income singles, families, seniors and disabled. Includes home, vehicle and personal loans.


Famous People with Disabilities - Well known people with disabilities and conditions who contributed to society.


List of awareness ribbon colors and their meaning. Also see our calendar of awareness dates.


Blood Pressure Chart - What should your blood pressure be, and information on blood group types/compatibility.





1 : Bias Keeps Women with Higher Body Weight Away From the Doctor
2 : Smart Hoteliers are Building a Healthier Future
3 : Teaching Baby Sign Language - Nita, Show Us More
4 : MitoQ Novel Antioxidant Makes Old Arteries Seem Young Again
5 : Telemedicine Helps Overcome Healthcare Gender Based Barriers
6 : Screen Reader Plus Keyboard Helps Blind, Low-Vision Users Browse Modern Webpages
7 : Our Digital Remains Should be Treated with Same Care and Respect as Physical Remains
8 : Tungsten: Concern Over Possible Health Risk by Human Exposure to Tungsten


Disclaimer: This site does not employ and is not overseen by medical professionals. Content on Disabled World is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a physician or other qualified health provider with any questions you may have regarding a medical condition. See our Terms of Service for more information.

Reporting Errors: Disabled World is an independent website, your assistance in reporting outdated or inaccurate information is appreciated. If you find an error please let us know.

© 2004 - 2018 Disabled World™