LAtest about moodmetric in research

Moodmetric technology shows great promise in identifying stress levels in a work environment

The Moodmetric smart ring for electrodermal activity measurement is an invention of a Finnish company Vigofere Oy. The inventor Henry Rimminen (Ph.D.) has a solid background in sensor technology and physiological measurements. He came up with the idea of incorporating the electrodermal activity (EDA) measurement into a ring in 2011. The measurement signal accuracy of the ring is comparable to laboratory devices and the research by the Finnish Institute of Occupational Health (Torniainen et al. 2015) has found the device valid for field research.

What is unique in the Moodmetric calculation

The Moodmetric index is calculated by an algorithm developed by Vigofere Oy.  The aim is to provide reliable electrodermal activity measurement data for field research, when persons are measured in their normal surroundings 24/7.

The novelty in the Moodmetric technology is calculating a single number (i.e. the Moodmetric index / the MM level) that describes arousal of a person on a scale of 0 to 100. It is comparable among different users and is comparable among different skin dryness levels of one user. It is robust and resistant to motional artifacts.

Electrodermal activity measurement

Electrodermal activity (EDA) is one of the most studied psychophysiological markers of the functioning of the autonomic nervous system and it has been applied in psychophysiological research for over 100 years (Boucsein 2012). EDA is an indicator of the sympathetic activity of the autonomic nervous system that is associated with emotion, cognition, and affection (e.g. Critchley 2002). The phenomenon measured is also known as skin conductance (SC) and galvanic skin response (GSR).

Where to measure electrodermal activity

The skin becomes a better conductor of electricity when the eccrine sweat glands process sweat to skin surface. Eccrine glands are innervated by the sympathetic nervous system and are part of ​the fight or flight response​ system. The palmar site of the skin or sole provide the best measurement points due the great intensity of the eccrine sweat glands. (e.g. Boucsein 2012.)

Factors that may affect the measurement

Diseases relating to the functionality of the autonomic nervous system may affect electrodermal activity measurement. Patients with hyper- or hypothyroidism have been recorded with unusual EDA measurements (e.g. Dolu et al. 1997; Dolu et al. 1999). Within a variety of anxiety disorders (e.g. panic disorder and posttraumatic stress disorder), increased electrodermal activity and reactivity has been observed (Braune et al., 1994; Hoehn et al., 1997, Lader & Wing, 1964; Blechert et al., 2007). However, in depression electrodermal activity is often reduced (Argyle, 1991; Ward et al., 1983).

The measurement of the electrodermal activity raw signal is sensitive to motion. The signal needs processing to reduce noise. The Moodmetric algorithm is foremost developed to focus on this task.

Electrodermal activity measurement has not been largely applied in clinical research until now. It has been limited to laboratory environment before the entry of wearable devices.

A White Paper, The Moodmetric Smart Ring Electrodermal Activity Measurement is free to download below by leaving your contact information.

Complete your name and email to read the content.
Terms of Use and Description of Our Service

Latest update: 12th June, 2019

The Moodmetric Services are provided by Vigofere Oy.

This page is used to inform website visitors and the Moodmetric ring, app and cloud service users regarding our policies with the collection, use, and disclosure of personal information if anyone decided to use our Service.

‘Service’ in this description means the complete offering of Vigofere Oy, including the Moodmetric ring purchase and rental, the smart phone app, the cloud service, browsing our website and subscribing to our newsletter. If you choose to use our Service, you agree to the collection and use of information in relation to this policy. Storing and use of personal information that we collect of you is described in this Privacy Policy.

The Moodmetric Service include the Moodmetric smart ring (available for purchase at the Moodmetric webshop), and the Moodmetric mobile app. The Moodmetric mobile app displays and stores the measurement data of the Moodmetric smart ring.

The Moodmetric ring automatically collects physiological data when worn. The measurement data is uploaded wirelessly to a smart phone phone via Moodmetric mobile app. You also have the possibility to choose to login to the Moodmetric cloud service, and then your data is made available to you there.

When purchasing our product or service, using our cloud service, browsing our website or ordering our newsletter, certain information is collected.

As a Moodmetric user, you are entitled to use our Service and content we provide. Using the Moodmetric Service (and/or providing input information) does not give you any legal right, title or interest in the Service or related software.

The app and cloud software may automatically download and install updates and upgrades from time to time without further notice to you. These updates are designed to technically improve and/or enhance the Moodmetric Service. You agree that we may automatically deliver such updates and upgrades to you as part of your use of the Moodmetric Service.

The Moodmetric ring is meant for recreational purposes only. Vigofere Oy’s products are not medical devices and should not be used to diagnose or treat any medical conditions. Moodmetric’s products are not authorized for use as critical components in life support devices or systems.

By using the Moodmetric products and Service, you accept that we collect data from you in accordance with this Privacy Policy.

Web shop
When you purchase our Service at our web shop, you will need to provide your credit card or other applicable payment method. We do not collect or store this information because we use a third party to process payments related to our Service. When making a payment, you should refer to the Privacy Policy of our payment processor Holvi.

Customer information and purchases
From all purchases, also those made outside our web shop, we collect and store the following information: your first and last names, your e-mail address, company name and company registration number, telephone number, address and other contact information. We also register possible product returns and reclamations.

This information is used primarily for delivery purposes, and should we need to contact you regarding your purchase.

We record information of our customers and other contacts in order to improve our Service: how and when our customer has been in contact with us, what was the reason for the contact and how the matter was resolved.

Measurement data
The Moodmetric ring measures electrodermal activity and movement. Parameters calculated from these measurements are stored in the Moodmetric mobile app.

The Moodmetric ring and smart phone app provide you the full benefit of your measurement. We do not access your measurement data, unless you login to the Moodmetric cloud Service. Login to the cloud Service is completely voluntary. It gives you the possibility to store your data (e.g. in case you loose your phone), and to easily review your history data.

Retaining of personal data
Vigofere retains personal data for the period of time a legal or regulatory obligations at minimum. Storage time of customer data can be longer for legitimate business purposes. The Moodmetric cloud service data of ended customer relationships is reviewed periodically and unnecessary personal data is removed.

Anyone has a possibility to order the Moodmetric Newsletter with a signup form at the Moodmetric website. Name and email address are stored at the newsletter service provided MailChimp (US). Opt-out from the list is possible any time.

The Moodmetric data can be stored to the Moodmetric cloud. Should you wish to you so, you need to separately agree to the terms and conditions of the cloud use.

Login to the cloud requires the following information: first name, last name, and email address.

This is the background information that we store. We keep your name and email address separately from your measurement data within the Moodmetric cloud. From the mobile app only the measurement data is transferred into the cloud, not manually added input. For instance Diary data from the app is not stored in the cloud.

We will never disclose any identifiable information about you to a third party. This can only be possible, if this is for your benefit and a separate agreement is made of it. A case like this would be for example, that you want your occupational healthcare provider to see your measurement data. In this case we provide access for this targeted third party with strict limitations and with your clear consent, that you can remove any time.

We can use your anonymous data (no name, nor email address) as a part of compilations, statistics and analyses for research, scientific and commercial purposes. We might use this data to enable us to monitor, review and further develop our products and Service, for our our internal records regarding the use of our Service and to support our sales and marketing.

We do no direct marketing except via our Newsletter, where you can sign off any time you want. We might contact you directly only in very important matters, such as product safety information or information regarding your product delivery.

The app does use third party services that may collect information used to identify you.
Link to privacy policy of third party service providers used by the app

Google Play Services
App Store Services
In a case of an error in the smart phone app we collect data and information (through third party products) on your phone called Log Data. This Log Data may include information such as your device Internet Protocol (“IP”) address, device name, operating system version, the configuration of the app when utilizing our Service, the time and date of your use of the Service, and other statistics.

Regarding our website and the cloud service we and our Service providers use server log information for purposes such as calculating site usage levels, helping diagnose problems and improve site maintenance. These server logs may include information such as your Internet Protocol (IP) address, host name, browser type, browser language, the date and time of your request, the time(s) of your visit(s) and the web page(s) that you visited. Collecting IP addresses is standard practice on the Internet and is done automatically by many web sites.

The Moodmetric cloud service is developed for Vigofere Oy for the purpose of storing the Moodmetric measurement data. The Moodmetric cloud data is stored in servers in Finland. Vigofere Oy does not transfer personal data outside of EU. The cloud service provider is Yoso Oy. The cloud hosting service provider is Data Center Finland Oy.

Mandatory disclosures: We may be obligated by mandatory law to disclose the data we collect to certain authorities or other third parties. We may also disclose and otherwise process the data we collect in accordance with applicable law to defend our legitimate interests, for example, in civil or criminal legal proceedings.

Corporate Transactions: We may disclose or transfer the data we collect in connection with the sale, merger, bankruptcy, sale of assets or reorganization of our company or other corporate settlement.

Cookies are files with small amount of data that is commonly used an anonymous unique identifier. These are sent to your browser from the website that you visit and are stored on your device internal memory.

This Service does not use these “cookies” explicitly. However, the app may use third party code and libraries that use “cookies” to collection information and to improve their services. You have the option to either accept or refuse these cookies and know when a cookie is being sent to your device. If you choose to refuse our cookies, you may not be able to use some portions of this Service.

We may employ third-party companies and individuals due to the following reasons: To facilitate our Service, to provide the Service on our behalf, to perform Service-related services, to analyze and market our Service.

These third parties may have access to your personal information. The reason is to perform the tasks assigned to them on our behalf. However, they are obligated not to disclose or use the information for any other purpose.

This Service may contain links to other sites. If you click on a third-party link, you will be directed to that site. Note that these external sites are not operated by us. Therefore, we strongly advise you to review the Privacy Policy of these websites. We have no control over and assume no responsibility for the content, privacy policies, or practices of any third-party sites or services.

Our Service does not address anyone under the age of 16. We do not knowingly collect personally identifiable information from children under 16. In the case we discover that a child under 16 has provided us with personal information, we immediately delete this from our servers. If you are a parent or guardian and you are aware that your child has provided us with personal information, please contact us so that we will be able to do necessary actions.

We collect and store a very limited amount of personal data. Personally identifiable information is in secure environment and we have taken reasonable steps to prevent unauthorized access, use, alteration, destruction or disclosure of this information.

A very small team can access to personal registers at Vigofere Oy. We will take all reasonable precautions to ensure that everyone inside Vigofere Oy who have been specifically granted access to information about you have received adequate training to ensure that they process that information only in accordance with this policy and with our obligations under applicable legislations.

Should you wish to review the data being held by us about you, you have the right to request details. Please make any requests in writing to us and we will comply with your request promptly.

Should you wish us to permanently delete your Personal Data being held by us, we will do so upon your request. We will delete all data, with the exception of the anonymized measurement data within the Moodmetric cloud service. In such case you understand, that we will not be able to provide the Service to you anymore.

The use of our Service requires a smart phone and an Internet connection. You are responsible for obtaining your own Internet connection, mobile and otherwise, to use our Service. You should understand that your mobile phone, computer and other electronic devices are susceptible to attack from third parties. We recommend you to use firewalls, store your passwords in a safe place, and create passwords for yourself that are strong. The security of your Internet connection and/or network is your responsibility and out of our control.

We may update our Privacy Policy from time to time. Thus, you are advised to review this page periodically for any changes. We will notify you of any changes by posting the new Privacy Policy on this page. These changes are effective immediately after they are posted on this page.

We hold and maintain the following registers containing identifiable information:

Vigofere Register of purchased products at the Holvi web shop
Vigofere Register of delivered products
Vigofere customer Register
Vigofere cloud service subscribers
Vigofere newsletter subscribers

If you have any questions or suggestions about our Privacy Policy, do not hesitate to contact us.

The Moodmetric services are provided by a Finnish company Vigofere Oy. Please find our more detailed contact information can be found at our website

Vigofere Oy, c/o HealthHub, Biokatu 6, 33520 Tampere, Finland
I agree with the "Terms & Conditions"

Stress measurement

There are little ambulatory measurement applications for stress available. Long term measurement is needed when a) wanting to understand is high stress load momentary or going on for weeks or months indicating chronic
stress b) motivating a person to efficient stress management with real time feedback. The Moodmetric smart ring fits these purposes well.

The Moodmetric measurement is well suited for preventive stress management in organizations and occupational health.

A customer story: HERE Technologies.

The Moodmetric ring and app

The Moodmetric smart ring measures electrodermal activity. It detects skin conductance with the band of the ring that works as electrodes. The band consists of two silver coated steel rings, and an insulator band in between them.

Moodmetric app is available for iOS and Android. The ring connects to the app via bluetooth and enables real-time monitoring.

Read more:

The Moodmetric cloud service

From the mobile app it is possible to download the data to the Moodmetric cloud. The cloud enables long term remote monitoring, and uploading the data from the cloud to further analysis in csv or excel format.

The Moodmetric Cloud Service Dashboard

The users can synchronize data from several smart rings to the cloud platform, and also export the data as CSV-file from the platform. The platform includes also a service for group monitoring, e.g. for monitoring the stress of teams or other organizational units. The platform provides also APIs for accessing the data and enabling to build third-party services.

The data sync from mobile to app is by default set to every three hours when within WiFi connection. The cloud data is thus possible to view almost real-time.

While the Moodmetric ring measurement sample rate is 3S/sec, the ring stores only 1 sample per minute. This is due to memory size limitation, and the intended use of the Moodmetric ring. The ring is primarily targeted to long term and continuous follow-up on stress levels, where the stored measurement points are sufficient. The stored ring data is transferred to cloud is thus also 1 sample per minute.

In the case of the Moodmetric smart ring, the data can be exported from the mobile device or accessed via the cloud. The most straightforward way is to download data from the cloud to excel or csv.

From the cloud the following data points can be accessed. However, for consumer use or long term stress management we always advice to use the indexed MM level. This is the most informative figure, and reliable also when the Moodmetric ring has been worn in normal circumstances. When the SCL or SCR levels are used, should a laboratory setting be applied.

Moodmetric datalog
The Moodmetric smartring datalog

From the cloud the datalog can be also downloaded as a CSV-file. The CSV-file is nearly identical with the datalog table presented above, however, the synchronization information is only stored in the mobile device and the CSV export from cloud contains device_id as additional variable.

API (Application Programming Interface)

The Moodmetric API makes it possible to benefit from data in the Moodmetric cloud. The Moodmetric API is a partner API type and available upon request. It is shared with companies building e.g. health data platforms. The aim is to increase use and awareness of the EDA signal by providing an open API to all requestors with appropriate solutions. Via the Moodmetric API it is possible to access the same datalog as described above.

SDK (Software developer KIT)

The Moodmetric SDK allows everyone to develop their own mobile applications using the Moodmetric measurement data. To ensure operation of 3rd party applications in any mobile platform or computer operating system, Moodmetric provides interface documentation directly to the ring. The platform running the 3rd party application must be bluetooth smart ready.

You can download the SDK for free here.

With the SDK you can access e.g. the Instant Indicator and the Moodmetric Index / the MM level.

The Instant indicator

The Instant indicator is a fast indicator on how the person reacts to different stimuli. These can be what you see, hear, smell or sense by touch at a certain moment. The response can be seen as an upward spike, which starts approximately after 1.5 seconds after the stimulus and peaks approximately after 2.5-3.0 seconds

The Moodmetric Index

The Moodmetric Index / the MM level is a continuous indicator on the wearer´s stress level on a scale of 0 too 100. The index is resistant to motional artefacts and comparable among different users.

Access raw data with the Windows PC logging software

The Moodmetric ring does not store raw data due to limited memory size. The Moodmetric ring measurement raw data can be accessed only by direct streaming from the ring to a Windows PC via a certain type of BLE dongle.

You can download a free package with drivers and short instructions here. Please note that this tool is primarily for research use, and we can not provide excessive user support for it.


Tomppa Pakarinen, Julia Pietilä, Hannu Nieminen. 2019. Prediction of Self-Perceived Stress and Arousal Based on Electrodermal Activity.
41st International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC).

Päivi Heikkilä, Anita Honka, Sebastian Mach, Franziska Schmalfuß, Eija Kaasinen and Kaisa Väänänen. 2018. Quantified Factory Worker: Expert Evaluation and Ethical Considerations of Wearable Self-tracking Devices. In Proceedings of Academic Mindtrek conference (Mindtrek 2018). ACM, Tampere, Finland, 10 pages.

Jussila, J., Venho, N., Salonius, H., Moilanen, J., Liukkonen, J., & Rinnetmäki, M. (2018, October). Towards ecosystem for research and development of electrodermal activity applications. In Proceedings of the 22nd International Academic Mindtrek Conference (pp. 79-87). ACM.

Jari Torniainen, Benjamin Cowley, Andreas Henelius, Kristian Lukander, Satu Pakarinen. 2015. Feasibility of an electrodermal activity ring prototype as a research tool. 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC).

Jari Torniainen, Benjamin Cowley. 2016. A short review and primer on electrodermal activity in human computer interaction applications (Benjamin Ultan Cowley, Jari Torniainen)

Past Moodmetric research projects

Frequently asked questions


University cooperation and research projects: Niina Venho –  [email protected] +358 40 710 4087