Scientists Innovate: Robotic ‘Third Thumb’ To Simplify Single-Handed Task

Researchers at the University of Cambridge have developed a new prosthetic device termed the “Third Thumb“. It is a robotic, 3D-printed appendage which can help an individual do tasks that are generally difficult to perform using one hand. The device is controlled by pressure sensors under each big toe and can be used by anyone, irrespective of age. The Third Thumb has made a promising development in the field of prosthetics and body augmentation and could make a significant difference in the lives of those who require it.

Quick Mastery of Abilities

A study published in the journal Science Robotics found that nearly all of the 596 participants, aged three to 96 and from various backgrounds, figured out how to effectively use the device within a minute. Over five days, participants demonstrated the Third Thumb’s quick and effective integration by performing two tasks: picking up pegs and placing them in a basket, and manipulating various foam objects quickly.

Professor Tamar Makin from the Medical Research Council’s (MRC) Cognition and Brain Sciences Unit at the University of Cambridge said, “To ensure everyone can benefit from these exciting advances, we need to explicitly integrate and measure inclusivity during the earliest stages of research and development.” 

Dani Clode, prosthetics and augmentation specialist at Cambridge’s Plasticity Lab and the lead designer of the Third Thumb, stated, “It’s equally important that these devices are accessible and functional for a wide range of users. Additionally, they should be easy for people to learn and use quickly.”

Performance Across Age and Gender

Older and younger adults had similar abilities in using the prosthetic device, though further investigation showed that older adults’ performance declined somewhat with age. This finding is attributed to the general degradation in sensorimotor and cognitive abilities associated with ageing, as well as a possible generational gap in technology familiarity. In the trials, performance did not significantly vary between genders or left- or right-handed people, even though the thumb was always worn on the right hand.

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Potential for Everyday Tasks

Professor Makin and colleagues believe the Third Thumb could be particularly valuable for people who have lost an arm and struggle with everyday tasks. They emphasize the importance of developing tools that are both functional and easy to use. The Third Thumb’s movement is directly proportional to the pressure applied, and releasing the pressure returns it to its original position, making it simple for users to control.

The development of the Third Thumb represents a significant step forward in prosthetics and body augmentation. Its potential to assist users in performing everyday tasks and its ease of use make it a promising tool for those in need. The quick mastery of the device by participants of all ages and backgrounds demonstrates its widespread potential and the exciting possibilities of future developments in the field.

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