The electrodermal activity (EDA) signal is prone to noise and quite difficult to interpret. To use the EDA signal in research in laboratory settings it is required to have a good knowledge of the signal characteristics. The MM level is an easy to interpret value to assess electrodermal activity (EDA) in long term measurements.
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.
Our recommended and simplest way is to use one value that is derived from the raw signal. Our proprietary algorithm calculates a single number – the Moodmetric level / the MM level, which reveals the psychological load of the user. The MM level is comparable among different users. It is robust and resistant to motional artefacts.
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.
Read more here: https://moodmetric.com/measurement-compares-to-you/
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 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 from 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.