doppel works with your body’s natural response to rhythm to keep you calm and focused. By affecting your brain's perception of your heart rate, doppel changes how you feel.

doppel creates a rhythmic pulse that you feel on the inside of your wrist as a heartbeat like vibration. Like listening to music, a fast rhythm helps you to feel more alert, a slower rhythm is calming.

But with doppel, there’s no noise and no distraction.

Our brains and bodies respond naturally to rhythm. This can be a biological rhythm. For example, the heartbeats of a mother and baby will synchronise with one another when they interact closely, and similar effects have been observed in couples

But humans don’t just perceive rhythms, we react to them on a very basic level. Two people walking next to each other will often fall into step without noticing. The tempo of a song can naturally alter our breathing rate and heart rate. In fact, researchers in Sweden found that not only can choir singers harmonise their voices, they can also synchronise their heartbeats. The team monitored the heart rates of singers and found that as the members sang in unison, their pulses began to speed up and slow down at the same rate.

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The link between heart rate and how a person is feeling is well known

Have a think about this scenario: It’s dark. You hear a noise, you begin to feel scared, and your heart starts pounding. And now think about this one: It’s dark. You hear a noise, your heart starts pounding and you begin to feel scared. Which is true?

In reality, both are true. Your brain and body are constantly talking to each other with each other. The physiological state of the body which is encoded in the heart, among other body organs, is relayed to the brain constantly, on every single heartbeat. Our feelings and mood are influenced by our heart rate.

Dr Manos Tskiris leads doppel’s independent testing

Dr Manos Tskiris leads doppel’s independent testing

This feedback loop is what psychophysiologists like doppel’s Psychology Expert Dr Manos Tsakiris, Professor of Psychology at Royal Holloway University London, are interested in. Psychophysiology is the study of the way in which your mind and body affect one another.

The science behind doppel draws on your brain and body’s natural response to rhythm, and also this feedback loop.

doppel uses the most natural rhythm that exists, the one we all experience first as embryos, and it does this silently, and subtly. We do not simply perceive this rhythm, but we entrain to it - a faster rhythm makes us more alert, and a slower one calms us down.

Our independent testing

doppel's award-winning technology has been scientifically tested and has been independently shown both to reduce stress and improve focus.

Stress less

Researchers at Royal Holloway University London assessed the calming effect of doppeland showed that it significantly reduces both physiological and subjective stress.

In a controlled, single-blind experiment (the participants were deceived about what doppel is and does), participants were asked to prepare to give a public presentation lasting five minutes. This is a standardised way of inducing stress. All participants wore doppel, but only half the group had doppel running for the whole time. The other half of the group experienced only one beat before it stopped.

Before and during the experiment researchers measured the participants’ skin conductance levels; the more stressed someone is, the more they sweat, and so their skin increases in conductivity.  They were also asked to complete a standardised questionnaire to measure self-reported anxiety levels both before and after the task.

The results of the experiment were clear.  Participants wearing the working doppeldisplayed significantly lower increases in skin conductance responses relative to baseline and reported lower anxiety levels compared to those with doppel switched off. Participants using doppel felt significantly less stressed by the task.

The results of the trial have been submitted to Nature Scientific Reports for other experts to review. It's called Wearing a heart on your sleeve: the calming effect of a new wearable device during the anticipation of public speech and we’re looking forward to sharing the link once published.

Keep focused

In a psychology lab Dr Tsakiris led an experiment where participants completed a controlled Psychomotor Vigilance Task (a sustained-attention, reaction-timed task that measures the speed with which subjects respond to a visual stimulus). Those wearing doppel set at 100-120bpm committed fewer lapses than the control scenario (wearing doppel switched off), irrespective of whether they performed the test with doppel or the control first. This shows that participants who felt the heartbeat-like vibration were more alert and focused.

Dr Tsakiris published his findings in this White Paper.

Beta testing

doppel has also been trialled by hundreds of people who have used it to focus at work, to stay calm in stressful situations, to set a pace while exercising, and much more.

Using Doppel on a low pulse has helped me get ready to sleep and if I woke in the night, it helped me get back to sleep easily and more deeply.
— Barbara Miles, Beta Tester
I’m feeling a little on-edge, ready to pounce on whatever task needs taking care of next. It’s very similar to the caffeine jolt I get after a big cup of strong coffee. Which is all the more surprising because I haven’t consumed any caffeine so far that day.
— Parmy Olsen, Forbes
I am astonished to find that I really do start to feel more alert and focused.
— Rosalyn Wikeley, Daily Mail