strongest reference for SSVEP and alpha?
Hi,
I'm having trouble getting meaningful EEG signals off MYSELF. I managed to get both ALPHA and SSVEP off my wife.
Setup:
32b OpenBCI
Headware from FRI (dry electrodes) and Velcro-based saline electrodes per @wjcroft.
Earclips for BIAS and SRB2 at two ears.
Fresh battery pack.
Dark, silent room.
Laptop on batteries.
All unnecessary electrical equipment turned off.
OpenBCI GUI used for raw recordings.
Custom Matlab code for post-processing (spectrograms, etc).
SSVEP with blinking movies (courtesy of Chip) and a blinking LED off an Arduino Uno board.
I was able to reproduce Chip's plots of his SSVEP experiments (from his raw data). This validates the post-processing SW.
I managed to get good ALPHA and SSVEP readings off my wife.
However, I'm failing to produce meaningful readings off myself for ALPHA and SSVEP experiments.
Here's a sample spectrogram of a session. http://dropcanvas.com/7ff34
The left-hand side upto the first vertical white dashed line is just me staring at the monitor with eyes OPEN.
The right-hand side from the first vertical white line upto the second white line is me sitting with eyes closed to evoke ALPHA waves.
I don't see them.
Furthermore, if you look at the plots, you will notice a relatively strong signal at 5, 7 and 9 Hz. These appear almost always at back electrodes no matter what I do.
Any ideas?
Thx,
David
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