Muse Direct (iOS+Cloud) FAQ
EEG is often broken down into what are called “frequency band powers”. There are 5 commonly used frequency bands: delta, theta, alpha, beta and gamma. The power of each band is indicative of the strength of oscillations in the corresponding frequency range in the EEG data. For example, delta corresponds to the slowest oscillations in the EEG signal – that is, below 4 cycles per second – and gamma corresponds to much faster oscillations – between 30-100 cycles per second. The division into frequency bands is useful because each band is loosely associated with different mental processes.
Muse Direct provides two different versions of band powers: absolute band powers, and relative band powers. Absolute band powers give an absolute measurement of power of the EEG signal in each frequency band. Relative band powers, on the other hand, are divided by the global power of the signal. Therefore, relative band powers are always between 0 and 1, as they represent a fraction of the total signal.
In addition to offering band powers, Muse Direct also provides band scores. Band scores are computed by comparing the current power of each frequency band to its recent history. Band scores are always between 0 and 1. An alpha score of 1 means that the current alpha power is very high in comparison to the alpha power recorded over the last minute or so. An alpha score of 0, on the other hand, means that the current alpha power is very low in comparison to the recent history. For more information, please consult the documentation here.
The absolute and relative band powers, as well as the band scores, can be used to design your own algorithms based on your own or external research. Band powers are automatically computed and saved when you record data with Muse Direct, and can be streamed with OSC to other programs or computers.
To set up OSC streaming for Muse Direct for iOS, the first thing you will need to do is determine the IP address of the computer you want to send the data to. This can be found as the IPv4 address under Advanced Network Setting on Windows 10 or under Network > Advanced > TCP/IP on Mac. An IP address has the form NNN.NNN.NNN.NNN where NNN is a number less than 256.
Once you have the IP address, go to the Streaming screen in Muse Direct for iOS. Tap the IP Address field and enter the IP address of the computer you want to send the data to. Then tap the “Enable OSC Streaming” toggle to turn on OSC streaming.
Muse Direct for Windows will stream the data to the local machine automatically on UDP port 7000. To stream data to a different machine using Muse Direct for Windows, see the online manual.
Go to Muse Direct cloud and login with your Muse account. From there you can download your files in various file formats.
The European Data Format “plus” (EDF+) is a flexible file format designed to store multichannel signals such as EEG, along with annotations. The EDF+ specifications are available here. EDF+ files can be imported directly into many EEG analysis packages, such as EEGLAB, Brainstorm, FieldTrip and MNE-Python(https://www.martinos.org/mne/stable/index.html). Please note that Muse Direct Cloud’s EDF+ files currently only contain EEG and annotations data.
See example JSON file.
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