Wednesday, October 28, 2009
Tuesday, October 27, 2009
OpenEEG Calibration/Testing
This was what I was hoping to see.The first attempt was corrupted due to a small error in the original version of my openEEG class library. After re-examining the firmware code, I've fixed the bug in version 1.0.0.1. This screenshot was taken using the new version of openEEG.dll and looks fine!
The new version is in the shared dropbox folder.
OpenEEG Calibration/Testing
This is a screenshot taken whilst using the calibration output of the analogue openEEG board connected to channel 1 and with channel 2 grounded. The calibration signal is a square-wave at around 14 Hz.Note that the analogue boards have coupling capacitors forming high-pass filters cutting off at about 0.1 Hz. This means that it can take up to around 10 seconds for the output data to settle down and become meaningful after changing the input connections. So you need to be patient!
The grounded channel seems to float towards the negative saturation level and stay there with occasional "noise" spikes. I'm not sure yet why it does this but it seems consistent from board to board.
Short Presentation Subjects
These are some suggestions for very, very short informal talks at our meetings.
The presentations should be only 4-5 minutes and you can sit and chat and wave your arms or stand and use a couple of powerpoint slides. Whatever is best for you.
Please make a comment to indicate which title you have selected.
What is a neuron and how does it work?
What are the frequencies of the brain?
An overview of modular OpenEEG (something very high level)
Dealing with noise - I(calibrating the board and the recommended enclosure)
Dealing with noise - II (mains hum and sheilded cables)
The digital signal output from the modular board (p2 format and sample rate)
Passive vs. active electrodes
Where and how to fit electrodes?
Application software (thoughts on, for example, C#, VB, Matlab, OpenVibe)
Signal processing (filtering and Fourier)
Neurofeedback in games (what's new and/or how it is used)
Neurofeedback/EEG in control applications (any examples whether helicopters or wheelchairs or robots)
Commercial Neurofeedback systems (any examples of real systems, costs and applications)
Neurofeedback with 2 channels (examples of what is possible)
Neurofeedback in therapy
(or perhaps you would like to suggest a title)
The presentations should be only 4-5 minutes and you can sit and chat and wave your arms or stand and use a couple of powerpoint slides. Whatever is best for you.
Please make a comment to indicate which title you have selected.
What is a neuron and how does it work?
What are the frequencies of the brain?
An overview of modular OpenEEG (something very high level)
Dealing with noise - I(calibrating the board and the recommended enclosure)
Dealing with noise - II (mains hum and sheilded cables)
The digital signal output from the modular board (p2 format and sample rate)
Passive vs. active electrodes
Where and how to fit electrodes?
Application software (thoughts on, for example, C#, VB, Matlab, OpenVibe)
Signal processing (filtering and Fourier)
Neurofeedback in games (what's new and/or how it is used)
Neurofeedback/EEG in control applications (any examples whether helicopters or wheelchairs or robots)
Commercial Neurofeedback systems (any examples of real systems, costs and applications)
Neurofeedback with 2 channels (examples of what is possible)
Neurofeedback in therapy
(or perhaps you would like to suggest a title)
Saturday, October 24, 2009
Wednesday, October 21, 2009
Tuesday, October 20, 2009
Monday, October 19, 2009
Biofeedback Journals
This is a link to an on-line Biofeedback Journal - . It looks very good. There is a 1997 special issue on neurofeedback. (Click on the text for the full articles).
There is also a Journal of Applied Psychophysiology - I'm not sure if this link will work. If not search our ejournal library with "Biofeedback".
Also - here's a link to an IEEXPLORE search on "biofeedback" and "EEG" sorted by date (newest first).
(Note - older references are fine for background but try to use more newer references to put your work in context.)
There is also a Journal of Applied Psychophysiology - I'm not sure if this link will work. If not search our ejournal library with "Biofeedback".
Also - here's a link to an IEEXPLORE search on "biofeedback" and "EEG" sorted by date (newest first).
(Note - older references are fine for background but try to use more newer references to put your work in context.)
Tuesday, October 13, 2009
Notes about the OpenEEG data format
It's actually not quite so easy to glean information on the data format at OpenEEG (unless I'm missing something). These notes and links may help.
The data (packet) format we get off our digital boards is called "p2" (packet format 2).
Details are under "Firmware 2" right at the bottom of the
main Modular OpenEEG page. This is the format of our data.
This link has it formatted better. Also see Tim's blog.
We are only using channels 1 and 2 (i.e., not 3-6). Note each channel is allocated 2 bytes; a high byte and a low byte. 10 bits of these 16 bits record the signal values (ie. we would expect the upper 6 bits to be zero).
The data (packet) format we get off our digital boards is called "p2" (packet format 2).
Details are under "Firmware 2" right at the bottom of the
main Modular OpenEEG page. This is the format of our data.
This link has it formatted better. Also see Tim's blog.
We are only using channels 1 and 2 (i.e., not 3-6). Note each channel is allocated 2 bytes; a high byte and a low byte. 10 bits of these 16 bits record the signal values (ie. we would expect the upper 6 bits to be zero).
Thursday, October 1, 2009
Neurofeedback Links
EEG Frequncies:
An interesting website on Brain and Health
Wikipedia on "Neuromarketing" Brain and Health (!!)
Neurofeedback for ADHD:
Faces of Neurofeedback:
Neurofeedback controlled helicopter:
An interesting website on Brain and Health
Wikipedia on "Neuromarketing" Brain and Health (!!)
Neurofeedback for ADHD:
Faces of Neurofeedback:
Neurofeedback controlled helicopter:
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