Frequently asked questions

What does the Moodmetric ring measure?

The Moodmetric ring detects sympathetic nervous system activation. High activation means positive or negative stress, low activation calmness/relaxation.

The sympathetic nervous system activation is understood by measuring electrodermal activity (EDA)  – also known as galvanic skin response (GSR) or skin conductance response (SCR).

The Moodmetric smart ring is designed to measure EDA accurately. The Moodmetric algorithm interprets the raw data with an easy to understand index from 1 to 100. This index is robust to motional artefacts and is comparable among different wearers.

What is electrodermal activity (EDA)?

Measurement of electrodermal activity is widely adopted in psychological studies. The activation of autonomous nervous system can be measured from skin conductivity.

The autonomous nervous system (ANS) reaction is the so called fight-or-flight response: a person sees, hears or experiences something that needs an action. This reaction is sub-conscious and in the early times of human history reserved for life-threatening situations.

Today, many people are in the heightened state of alertness continuously – they experience stress. Also positive stress can wear out when it keeps a person active for long periods of time, without proper recovery.

Read more

What is the physiological mechanism behind EDA?

The skin on the palmar of a hand has a high density of sweat glands that react with any signal of the sympathetic autonomous nervous system. These reactions ultimately make the hands sweat, and the skin conductivity increases. This phenomen is electrodermal activity and can be best measured from palm or fingers.

Does the Moodmetric ring  measure heart rate?

No, there is no measurement of heart rate, nor heart rate variability.

Is the Moodmetric measurement accurate?

Yes, the measurement signal has been verified by the Finnish Institute of Occupational Health. The ring is valid for field research.

Why a ring and not a wrist device?

The skin conductivity measurement requires high density of so called eccrine sweat glands. To get an accurate measurement it has to be done from highest density areas: palms of a hand or fingers, or soles of feet. Read more here.

Does the moodmetric ring tell about wearer´s emotions?

No, the measurement does not indicate mood or emotional state of the wearer. The Diary feature in the Moodmetric app gives a possibility to indicate positive of negative mood in relation to certain calendar event.

Can several people use one Moodmetric ring?

The ring is meant to be personal. It has a  learning algorithm that adjusts to one user in about 12 hours.

When changing from one user to another, the calibration time needs to be considered: during the first hours the measurement results tend to be closed to median (50) than later on.

The ring can is used for instance to user experience testing, where wearer´s change continuously and wearing times are short. In these cases at least 30 minutes calibration time should be allowed and the wearer should both try and relax properly and get excited during that time. This enhances calibration and makes the test more accurate.

Are measurement results between users comparable?

Yes. The Moodmetric index learns the base line of the user and gives 100 for the detected maximum reaction and 1 for the minimum. Lowest reaction typically occurs in deep sleep and maximum in a very exciting or frightening situation.
When two persons each have their app showing 100, they are both in their maximum alertness level.

How the measurement results can be interpreted?

Please refer to this article:

How to interpret the Moodmetric data

How does Moodmetric send the data from the ring to the phone?

The ring uses Bluetooth Smart to communicate with your smartphone.

Do I need to keep my phone close to the ring?

No. The ring works standalone and stores the data up to 270 hours. The data can be downloaded whenever you open the app. It is however adviced to download the data from the ring to the phone at least once per day.

Is the ring waterproof?

No. It is only splash proof.

Does Bluetooth need to be on at the device always?

No, you can keep BT off, except when downloading data from the ring to the device, or when you follow the real-time signal on the phone.

Note, that if BT has been turned off, you might need to refresh the connection when going to the app: choose Menu, choose your ring until the Ring details screen opens. Verify that the ring is connected with the phone (when connected, it says ‘Forget’ at the bottom left corner.

What if there is no measurement signal?

If the measurement signal does not appear on the app, or the app does not find the ring, please try the following:
– Turn bluetooth is turned ON on the device
– Charge the ring
– Check that the ring is connected to the app
– If your hands are very dry or cold, try and add some moisturizer for a better skin contact
You can also
– Try to turn the bluetooth OFF and back ON
– Shut down the app and open it up again
– Plug the ring and lightly touch the band and while doing so, try to find the ring with the app

How do I find the right ring size?

The Moodmetric ring comes in five sizes, inner diameters being: 16mm, 17mm, 18.5mm, 20mm and 21.5mm.

The ring can be worn in any finger except the thumb. It can also be changed from one finger to another, e.g. at night it is good to put it to a finger where it a loose –> the fingers normally swell a bit during the night.

Note that the finger sizes are different in the right and left hand, this facilitates in finding the best fit.

The right size can be found by measuring inner diameter of an existing ring or using a sizing chart, for example

Where can I download the app?

From AppStore  and GooglePlay.

Do you have a Developer Kit?

Yes, the Moodmetric Software Developer Kit is available. Inquiries: [email protected]