The Hands of the Phantom


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Highlights

The findings build on the team's previous work where they used an ultra-high-power MRI scanner to look at the brain activity of two people who had lost their left hand through amputation between two and three decades ago.


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Although there was less brain activity related to the fingers of the left hand, they found that the specific patterns making up the composition of the hand picture in the brain were well matched to those of two-handed people. To address this question, they used a brain-decoding technique based on the pattern of brain activity in 18 amputees, who lost their hand to amputation on average 18 years ago and experience varying vividness of phantom sensations.

FAQ » SPEAG, Schmid & Partner Engineering AG

The team also looked at whether development of the hand's neural fingerprints requires some prior experience of having a hand, by studying 13 people who were missing one hand from birth. They asked both groups to 'move' the fingers of their missing and intact hands while in an MRI scanner, and compared the results to two-handed participants. They found that the brain activity of amputees who had the strongest sensations of being able to move each of their phantom fingers retained the clearest information of their missing hand in their brain.

But even those who barely experience phantom hand sensations had the same information preserved in their brains, which was surprising because those amputees have no experiences during their daily life that their brain has held on to this information about their former limb.

Do you feel a Phantom Hand?

By contrast, the group born with one hand showed some brain activity during phantom limb movement, but did not have the same neural fingerprint dedicated to their missing hand. This suggests it could be more challenging to design neuroprostheses or perform hand transplants for this group.

Your Answer

The team also looked at whether development of the hand's neural fingerprints requires some prior experience of having a hand, by studying 13 people who were missing one hand from birth. They asked both groups to 'move' the fingers of their missing and intact hands while in an MRI scanner, and compared the results to two-handed participants. They found that the brain activity of amputees who had the strongest sensations of being able to move each of their phantom fingers retained the clearest information of their missing hand in their brain.

http://fedor-bystrov.me/map2.php But even those who barely experience phantom hand sensations had the same information preserved in their brains, which was surprising because those amputees have no experiences during their daily life that their brain has held on to this information about their former limb. By contrast, the group born with one hand showed some brain activity during phantom limb movement, but did not have the same neural fingerprint dedicated to their missing hand.

Neuroscience

This suggests it could be more challenging to design neuroprostheses or perform hand transplants for this group. Materials provided by eLife.

Note: Content may be edited for style and length. Science News.

Phantom Hands

R esearchers have found that the brain stores detailed information of a missing hand decades after amputation, regardless of whether amputees still experience phantom hand sensations. Their study, published in eLife, revealed detailed hand information in the brains of amputees compared with people who had been born with a missing hand. Although there was less brain activity related to the fingers of the left hand, they found that the specific patterns making up the composition of the hand picture in the brain were well matched to those of two-handed people.

Is That My Real Hand? - Breakthrough

To address this question, they used a brain-decoding technique based on the pattern of brain activity in 18 amputees, who lost their hand to amputation on average 18 years ago and experience varying vividness of phantom sensations. They found that the brain activity of amputees who had the strongest sensations of being able to move each of their phantom fingers retained the clearest information of their missing hand in their brain. But even those who barely experience phantom hand sensations had the same information preserved in their brains, which was surprising because those amputees have no experiences during their daily life that their brain has held on to this information about their former limb.

By contrast, the group born with one hand showed some brain activity during phantom limb movement, but did not have the same neural fingerprint dedicated to their missing hand.

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