What is Haptic Feedback?
Haptic feedback is the use of touch to communicate with users. Most people know the feeling of a vibration in a mobile phone or the rumble in a game controller – but haptic feedback is much more than that. Robert Blenkinsopp, VP Engineering at Ultraleap, explains why.
Why does haptic feedback matter?
Human beings have five senses, but electronic devices communicate with us using predominantly just two: sight and hearing.
Haptic feedback (often shortened to just haptics) changes this by simulating the sense of touch. Not only can you touch a computer or other device, but the computer can touch you back.
Haptic feedback is a mode of communication rather than a specific technology or application. It’s nothing less than an entirely new way for machines and humans to communicate.
What does haptic feedback feel like?
The tactile sensations most people think of when they say "touch" are part of what is known as the somatosensory system. This encompasses a huge variety of sensations, not just sensations such as vibration or pressure, but also things such as pain, temperature, and the position and movement of your body in space.
The somatosensory system includes at least 12 specialised types of receptors. Each sends different information to your brain: one type sends information about vibration, one about pressure, one about pain, and so on.
These receptors are all over the surface of your body, and inside it, too. The average adult has 3 million pain receptors alone.
In theory, haptic feedback encompasses any and all of these sensations. However, simulating the somatosensory system in its entirety is a huge challenge (according to Microsoft, “many orders of magnitude larger in complexity” than sight or sound). There are also some sensations – such as pain – you probably don't want users to experience.
In practice, haptic feedback always targets a specific subset of your somatosensory system. A large number of haptic devices (from game controllers to mobile phones to our own "virtual touch" haptics) communicate solely via the receptors on your hands, for example.
Some types of sensations are also easier to create than others. The widespread use of relatively simple vibrations in mobile phones shows how even limited use of haptic feedback can be very effective.
How does haptic feedback work?
While the tiny devices that create vibrations in a mobile phone are probably the best-known haptic technology, there are many other ways to simulate touch. Some, such as Ultraleap's "virtual touch" ultrasound technology, create tactile sensations in mid-air. The user does not even need to be in contact with a physical surface.
Haptic technology ranges from the vibrations in mobiles through to wearables (such as the haptic alert you get from a Fitbit when you complete 10,000 steps), controllers, and the use of virtual touch haptic modules combined with digital billboards.
At the high end are robotics, exoskeletons and full-body suits that look like something out of Ready Player One. Today these are largely confined to military and industrial applications.
Even a brief overview of haptic technology would require an entire blog post on its own. But, more importantly, why do product designers add haptic feedback at all?
What is the purpose of haptic feedback?
Visual feedback is used for many different purposes, from a flashing warning light to a desktop interface to the immersive experience of a VR headset. It’s the same with haptic feedback: there’s a rich spectrum of ways in which it can be used.
In our bodies, the somatosensory system is involved in everything from establishing a sense of presence, to emotional connection and wellbeing, to enabling us to explore and interact with objects, to providing 360° sensory feedback. At Ultraleap, we’re already seeing our technology used to achieve very different things in different applications.
In automotive, haptic feedback allows manufacturers to create non-visual modes of interaction, reducing the amount of time drivers take their eyes off the road. However, in marketing then it’s the emotional component of touch that is important: adding haptic feedback is proven to have a significant impact on customer engagement.
When added to user interfaces, haptics is all about reducing task completion time and improving accuracy. Multisensory experiences that incorporate haptics are increasingly recognised as central to natural interaction and the next generation of UX design.
The role of haptic feedback in VR, in contrast, is largely about increasing users’ sense of presence. This isn’t simply about making virtual bubbles feel like real bubbles popping on your hands. Haptic feedback allows storytellers to create experiences that we can’t have in the real world: to feel a dragon’s breath, touch a ghost, or cast a magic spell.
I could give many more examples (education and training, industrial, medical, smart home…). The real point, though, is that haptic feedback is best understood as a new tool in the hands of product designers, whatever sector they are in and whatever they are trying to communicate.
Haptic feedback is a tool that both enhances audio-visual communication and opens up the possibility of creating new products and markets. It’s a tool we are only just starting to understand the capabilities of, with a language we are still writing the dictionary for.
To find out more about how Ultraleap's virtual touch haptic technology creates the sensation of touch in mid-air, head over to our technology page.
And hold on tight. It’s going to be one hell of a ride.
Robert Blenkinsopp was Ultrahaptics' employee #1 and is now VP Engineering at Ultraleap, exploring and developing new forms of interaction enabled by mid-air haptics and hand tracking.