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  FEBRUARY 14, 2019 by MAE CHAN
Haptic Communication Is Critical To Our Society


Researchers at Tokyo Institute of Technology, Imperial College London and the University of Tokyo have demonstrated that physical coordination is more beneficial in larger groups due to haptic communication.

The researchers used robotic interfaces to test coordination in groups of two, three and four partners, and found that performance was improving with every additional group member.

The researchers believe the findings can clarify how a group of people can work together, for example to move and maneuver a large table together. This may also lead to improving the outcomes of physical rehabilitation by training patients in groups.

Scientists from Imperial College London, CNRS in France and ATR in Japan previously revealed the haptic communication in pairs in a task similar to partner dancing, and showed how performance at a physical task is improved and learned better when practicing with a partner.

The new study, published today in eLife, extends this finding to trios and quartets by clarifying haptic communication in groups critical to society.

Touching
gives the world an emotional context. It builds trust and promotes teamwork, wins friends and influences people. But that's not all. Beginning in the womb, it may guide the development of regions in our brain that govern social behaviour. It could even give us our sense of self. The touch of others makes us who we are.

Dr Atsushi Takagi, lead author of the study who resides at the Institute of Innovative Research at Tokyo Institute of Technology (Tokyo Tech), said: "We were shocked by how well and fast partners learned to coordinate as a group through touch. Imagine trying to move a banquet table at a crowded wedding venue. With verbal communication, it's immensely challenging to coordinate with others to ensure the table doesn't bump against something, and the more people there are, the longer it takes to reach verbal consensus. With touch, coordination emerges in a matter of seconds, and the time taken to reach consensus is the same, irrespective of group size."

Professor Etienne Burdet of Imperial College, the senior author of this study, added: "We expected that the performance would deteriorate with the noisy force of each additional group member. However the performance improved with each group member, as each individual connects to a virtual collective hand which is the average of all partners' hands, so that the noise decreases with the number of partners".

The researchers found that the key to physical coordination was the ability to infer the group's goal through touch. The same coordination mechanism was used in a previous study by Takagi and colleagues to design a "human-like" robot partner that coordinated with a human partner.

In the new study, the researchers conducted computer simulations of the task to test what information was shared within the group through touch. Takagi believes that a deeper understanding of the coordination mechanism will yield an algorithm for a group of robots to carry out physical tasks together.


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