This week, I organized two hardware tests. The first test revealed the contact quality issue, which was unexpected. I subsequently contacted Emotiv customer support for the contact quality issue, training issue and raw data stream API issue. The second test confirmed that wet hair with plenty of glycerin can stabilize the contact quality to 100%. Next week I will record real data with good contact quality and start testing our denoising algorithm with the real data.
We tried multiple ways for differentiating the brainwave signals. In the picture above, we tested whether seeing different colors would result in a visible difference. We also tested temperature, pain, movement, and sound. So far, movements seem to be the most effective cue. We are still looking into more training procedures and signal processing techniques to improve our detection.