With multiple serial connections to custom free software.
* How is all equipment mounted mechanically and connected?
GPS (using LS20031 from http://www.tinkersoup.de/product_info.php?products_id=643), high and low frequency electromagnetics, local temperature, light, entropy and magnetic field gradient (FGM-3 from http://www.speakesensors.com/products.htm ).
Following the openeeg project.
Possibly use active electrodes:
http://openeeg.sourceforge.net/doc/hw/joe_ae/ NON! 2x batteries per electrode. but now we need to adapt own openEEG case!
http://uazu.net/eeg/ae.html : looks good for easy prototype
TODO: select design, order parts, build and test. Also resolve electrode placement (do we use 2 channels?), and cabling:
Maybe start with one channel (= 2 electrodes+DRL).
Common reference electrode positions are Cz, earlobes, mastoids, and the tip of nose.
If you only use one channel, you should connect your third (reference) electrode not to DRL but rather to VGND (this will however increase 50/60Hz noise). Or, if you do use DRL, connect CH2+ and CH2- to VGND or DRL.
Note difference between monopolar and bipolar setup:
By default, one always use differential amplifier (2 inputs: 1 non-inverter and 1 inverter input) which means that we are starting with a bipolar setup.
For instance, If you have 4 dif amplifier you will have 8 electrodes (e1,e2,e3,e4,e5,e6,e7,e8) over scalp but plotting 4 channels: 1st channel = e1-e2; 2nd channel = e3-e4, 3rd channel = e5-e6; 4th channel = e7-e8.
Now, if you want a monopolar set up with this example, you should “short circuiting” electrodes e2, e4, e6 and e8 together. So, you have a “new channel” called REF (REF=e2, e4, e6, e8 jointly). Now, you will have only four electrodes over scalp (e1, e3, e5 and e7), and the 5th electrodes will be REF (right mastoid for example). Your new recording will be monopolar with:
1st channel = e1-REF; 2nd channel = e3-REF, 3rd channel = e5-REF; 4th channel = e7-REF.
Bipolar: two electrodes on either side of the back of the head
Monopolar: one on the forehead and one on the vertex (top) of the head
Placement guide: www.focused-technology.com/downloads/eeghook1.pdf
Suggests either Mastoid or ear for reference, and Cz for other electrode with DRL on wristband
We could also combine plethy and DLR?
Ref for placement: http://www.bci2000.org/wiki/index.php/User_Tutorial:EEG_Measurement_Setup
skin resistance (GSR), skin temperature, blood flow (plethysmograph), optional skin impedance (in fingers as perhaps replacement for plethysmography)
Earth resistance, scanning and inscription.
Skin environment feedback (a moving needle, electroshock).
Python software (running on attached laptop) features:
Questions to resolve: