For centuries, scientists have viewed touch as a short-range sense that works only when direct contact occurs.
However, a surprising new study suggests that human touch may be much more powerful than previously believed. Researchers have found evidence that people can sometimes detect objects hidden beneath materials such as sand before their fingers actually touch them.
The discovery suggests that humans may possess a little-known ability that works somewhat like a form of “remote touch.”
The research was carried out by scientists from Queen Mary University of London and University College London. Their findings were presented at the IEEE International Conference on Development and Learning (ICDL).
The study challenges long-held ideas about how the human sense of touch works and may lead to new technologies inspired by human tactile abilities.
The idea for the study came partly from observations in nature. Some animals are known to detect objects that they cannot directly touch. Shorebirds such as sandpipers and plovers are famous for finding prey hidden beneath sand and mud.
These birds use highly sensitive beaks to detect tiny vibrations and pressure changes that travel through the ground. Even when the prey is buried and invisible, the birds can often locate it successfully.
Scientists wondered whether humans might possess a similar but previously unnoticed ability.
To investigate this possibility, the research team designed a series of experiments. Volunteers were asked to move their fingers gently through sand while searching for a small cube hidden underneath the surface. Importantly, participants were instructed to identify the location of the buried object before physically touching it.
The results surprised the researchers.
Many participants were able to locate the hidden cube at rates far better than random guessing. Their fingers appeared to detect very small changes in the sand caused by the buried object.
As the fingers moved through the material, tiny mechanical signals traveled through the sand and reflected off the hidden cube. These subtle changes created clues that participants could sense without realizing exactly how they were doing it.
In simple terms, the buried object slightly changed how the sand responded to movement. Human hands were sensitive enough to pick up these differences and use them to estimate where the object was located.
The researchers then used computer models to better understand what was happening. They analyzed the physics behind the movement of the sand and the signals produced by the hidden object. Their calculations revealed something remarkable: human tactile sensitivity was extremely close to the maximum level allowed by the laws of physics.
This means that our hands are nearly as sensitive as they could possibly be when detecting tiny vibrations and mechanical signals in materials like sand.
To see how human abilities compared with modern technology, the team also tested a robotic system. The robot was equipped with a special tactile sensor and trained using an artificial intelligence system called a Long Short-Term Memory, or LSTM, network. This type of AI is designed to recognize patterns in sequences of data.
The robotic sensor was able to detect hidden objects from slightly greater distances than humans. However, it was less reliable overall. While human participants correctly identified hidden objects about 70.7% of the time, the robot achieved an accuracy rate of only around 40%. The machine often reported finding objects when none were present.
This finding highlights an important difference between humans and machines. Although advanced sensors and artificial intelligence can sometimes exceed human abilities in certain situations, the human nervous system remains exceptionally skilled at interpreting complex sensory information.
According to the researchers, this is the first study to demonstrate that humans can genuinely detect hidden objects without making direct physical contact.
Dr. Elisabetta Versace, a Senior Lecturer in Psychology at Queen Mary University of London who led the human experiments, said the findings change the way scientists think about perception. She explained that remote touch in humans had never been studied before and that the discovery expands our understanding of how people experience the world around them.
The researchers believe the findings could have practical applications far beyond basic science. By understanding how humans detect subtle tactile signals, engineers may be able to design more sensitive robots and assistive technologies.
Future robots inspired by human touch could help archaeologists locate fragile objects buried underground without damaging them. Similar systems might be used in disaster zones where visibility is poor or where dangerous conditions make direct exploration difficult.
Researchers also suggest that future robotic explorers on planets such as Mars could use touch-based sensing to investigate buried materials hidden beneath dust and sand.
Ph.D. student Zhengqi Chen, who worked on the project, said the discovery could inspire entirely new types of robots capable of performing delicate tasks in environments where vision alone is not enough.
Dr. Lorenzo Jamone, Associate Professor in Robotics and Artificial Intelligence at University College London, highlighted the unique collaboration between psychology, robotics, and AI. He explained that the human experiments helped researchers teach robots how to “feel,” while the robotic results provided new ways to understand human sensory abilities.
The study demonstrates how research involving both humans and machines can lead to important scientific discoveries and technological advances.
Perhaps the most fascinating aspect of the research is what it reveals about ourselves. Most people think they know the limits of their senses.
Yet this study suggests that humans may possess abilities that have gone unnoticed for generations. Just as certain birds can sense prey hidden beneath sand, people may also be able to detect unseen objects through tiny physical signals traveling through the environment.
While much more research is needed, this discovery offers a fresh perspective on one of our most familiar senses. It suggests that touch is not simply about direct contact. Instead, our hands may be quietly gathering information from the world around us long before we realize it.
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