The MM level – or the Moodmetric level – is the basic concept in Moodmetric measurements. It is an integer or 1 to 100 that is derived from the electrodermal activity (EDA) raw signal. The MM level has been developed for easy interpretation of the signal, also for those with no prior knowledge of the EDA measurements.
The MM level is an easy to interpret value to assess electrodermal activity (EDA) in long term measurements. The MM level is comparable among different users. It is robust and resistant to motional artefacts.
Min and max values and what happens while calibration
When first taking the Moodmetric smart ring to use, the ring is first connected to the Moodmetric app and the a button ‘Calibration’ is tapped. This initiates a key process where the maximum and minimum arousal level of the user is detected.
The maximum level found during ~12 hours is the person´s MM level 100 and the minimum is 1.
Note that in absolute values (microsiemens) the max and min are different from one user to another. On the other hand, in a particular situation the MM level is comparable between users. For example: watching a horror film might make someone react with maximum intensity (100), another with just 95.
Note: Absolute values are not visible on a smartphone screen. Due to screen size limitations, the real-time curve is auto-scaled.
The MM level benefits in research
The electrodermal activity raw signal is prone to noise and difficult to interpret. To apply it in research it is required to have a good knowledge of the signal characteristics.
Moodmetric has understood this issue and provides an EDA measuring device that makes it possible to use the signal without prior knowledge of electrodermal activity. Raw signal tools are available for those who know the signal characteristics and understand the laboratory setting limitations when measuring electrodermal activity.
How is the MM level calculated
The basic principle of the algorithm is that it compares changes in electrodermal activity to the typical, standard values measured for an individual over the time of wearing the Moodmetric ring. This means that unlike many consumer trackers the Moodmetric measurement result is not compared to reference data.
The MM level is determined from the typical features associated with electrodermal activity: skin reactions per minute (SCR frequency), reaction amplitude and skin conductance level (SCL).
The MM level can be observed in real time
The MM level can be observed in real time on a smartphone screen. On the screen you see it counted as moving average over 3 minutes.
A clear visualization showing 12 hours’ values (MM level average / minute) at the time is also updating continuously at the Moodmetric app.
The MM level is available at the Moodmetric cloud
The MM level is available at the Moodmetric cloud at sample rate 1 sample / minute.
Electrodermal activity features, such as SCL and SCR/min are also available from the cloud at the sample rate 1 sample / minute.