Did anyone manage to produce Alpha signals using dry-electrodes?

sharoniosharonio Israel
edited March 2018 in Electrodes
We are a group of grad students (all highly proficient with lab eeg equipment), looking for dry electrodes for an Alpha-controlled interactive simulation.

We started off by examining wet electrodes with 3 sensors -> forehead, behind ear and on the cheek. that worked WELL (blinks + alpha signal at relaxation with eyes closed).

Dry options that didn't work:
1. Florida head-set with 3 electrodes on the forehead and 2 behind the ears, using their kit.
2. Cognionics comb-like sensors

What kind of worked (produced a noisy signal that we are trying to improve):
1. Cognionics silicone flat sensors.

If you already went through this rocky road and have insightful notions - we would highly value them.
Thank you
Orian

Comments

  • wjcroftwjcroft Mount Shasta, CA
    Best 10-20 EEG scalp sites for strongest alpha generation are in the posterior: O1 O2 P3 P4, etc. 


  • sharoniosharonio Israel
    Thanks for the response Wjcroft, we are aware of the areas at which Alpha waves are strongest at.
    However, we are asking specifically about areas with no hair because our device would be placed at a science museum and must be easily self placed and adjusted by all users without help.

    As the wet electrodes on the forehead and behind ear locations (T3/T4) produced the desired signal, we suspect a further examination of dry electrodes at the same location could also produce a good signal - this post was written to find possible colleagues that have managed to do it already


  • wjcroftwjcroft Mount Shasta, CA
    Have you considered the Interaxon Muse headset? It is in use in many exhibit type applications. It uses silver dry contacts on the forehead and conductive rubber at the ear pieces. At least it could give you another benchmark for dry sensor performance. And may be likely one of the easier devices to fit for the general public.
  • sharoniosharonio Israel
    A previous interactive art installation we did used Muse so we are familiar with it. According to our experience their Bluetooth transmitted signal has consistency issues. That's what caused us to examine alternatives in the first place :) 
  • wjcroftwjcroft Mount Shasta, CA
    Orian, hi.

    Bluetooth connectivity can be strongly influenced by neighboring emitters of microwave band signals: wifi, cellphones, hotspots, towers, etc. 

    Another intermediate step between wet and dry are 'saline' based electrodes. Which have a saline moistened pad / sponge between the electrode metal and the skin. You can see a range of these on this page,


    Regards,

    William

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