Active Electrode Building Guide. [Up to my homepage] IMPORTANT NOTE: Please do not contact me about the active electrodes.
You will get more help if you send an email to the OpenEEG mailing list. Also, check out Olimex if you're interested in buying a preassembled active electrode. This guide should help you to build Active Electrodes for the modularEEG, as proposed by Jarek Foltynsky here. The active electrodes described here correspond to the modified circuit diagram suggested by Joerg Hansmann: This guide proposes a tradeoff between building simplicity and signal quality. Please be warned that making AEs is not a simple task. In a previous design, I tried a rectangular pin array, but I didn't work. Examples: A recording. Three eye blinks and tooth grinding. You can download a test recording here: [Test data - P2 Format] [Test data - P3 Format] Some pics...
My complete ModEEG. Frontal view. Back view. There are 2 channels + 1 DRL. That's me with the 2 channels and holding the DRL. ©2004 by Pedro Ortega <firstname.lastname@example.org> MindFlex xbee eeg hack. Heyo guys, this is my last ultimate hack for the mindflex.
I wanted to reproduced the results of the mindflex as indicated by the manufacturer.The simplest test that can be done with an EEG device is to check if the alpha waves go up significantly when closing your eyes. However doing some test with different subjects (i.e. my guinea pig students/friends) and with or without electrogel I couldn’t find any prove that the neurosky chip is working properly.
I will be happy if somebody can reproduce a high alpha activity with closed eyes. I could only see some random peaks in the alpha activity during closed eyes which were not stable. So you take out of the shell 3 wires: black is the GND, blue is the Vcc=3.3V and white is the TTL signal at 9600 bauds. Stream directly to the computer and one which uses a xbee transmitter and an xbee receiver.
As I said before I totally desoldered the original radio modem that was on the main board inside, as in Figure. What can I do with that? Wave exporter. Mindflex hack. Arturo Vidich, Sofy Yuditskaya, and I needed a way to read brains for our Mental Block project last fall.
After looking at the options, we decided that hacking a toy EEG would be the cheapest / fastest way to get the data we wanted. Here’s how we did it. The Options A non-exhaustive list of the consumer-level options for building a brain-computer interface: Open EEG offers a wealth of hardware schematics, notes, and free software for building your own EEG system. The Nerosky MindSet is a reasonable deal as well — it’s wireless, supported, and plays nicely with the company’s free developer tools. For our purposes, though, it was still a bit spendy. Given all of this, I think the Mind Flex represents a sweet spot on the price / performance curve. But first, the inevitable caveat: Use extreme caution when working with any kind of voltage around your brain, particularly when wall power is involved.
The Hardware Here’s the basic layout of the Mind Flex hardware. The Hack Parts list: Software list: Thinking Cap. Alternatives: An alternative to finding electrodes and doing all the amplification DIY-style, it's now possible to purchase a single channel off-the-shelf headset from Neurosky which sends the raw EEG via bluetooth.
In addition to potentially being easier to set up and using dry electrodes, this system also ensures user safety by removing the user from any possible shock hazards associated with being attached to wall power. The major drawback is that it has only a single channel, but maybe this will improve in the next version. Emotiv has a headset with many channels, but they are currently not as DIY friendly due to the fact they will not allow users access to raw EEG data, but only to their processed data. Maybe we need some pressure from the DIY community here or someone to reverse engineer their processor. Mindmachine. Solson EEG. Around 1967 a fellow named Maurice "Barry" Sterman discovered that cats could be trained to alter their brain waves, and that these same cats were less susceptible to having seizures when injected with monomethylhydrazine (rocket fuel); hence the start of some very interesting research into neurofeedback.
I was told of two books on the subject, which I have purchased, read, and would recommend: A Symphony in the Brain, by Jim Robbins, and Getting Rid of Ritalin, by Robert Hill and Eduardo Castro. I have purchased and would NOT recommend ADD The 20-Hour Solution by Steinberg and Othmer. Only click this if you want to hear me rant. Besides the above mentioned books, and general Googling, I've have learned the most about measuring brain waves (EEG signals) from The OpenEEG Project. They have posted schematics for a few different DIY EEG designs, and even arranged for a company to sell you assembled circuit boards for about $200.
Here are some links to stuff that I have learned from. My EEG. Biosemi. OCZ Neural Impulse Actuator. EEG/EKG Schematics by +1+1+1. EEG & EKG (ECG) Schematics last updated 7-Jan 2005 I developed my 4-channel, dual-purpose EEG/ECG box between September 2003 and March or April of 2004 with the gracious help of David Rosenboom at Calarts for use in my medi[t]ations sound performance series.
We combined schematics from his book Biofeedback and the Arts (available thru Frog Peak Press) with schematics from the article "Computers On The Brain" by Steve Ciarcia (in the June 1998 issue of BYTE magazine). We are also indebted to Ronald Kuivila who was instrumental in unlocking the mystery of how to get the low-frequency audio signal into my computer and subsequently into SuperCollider...
WARNING: USE AT YOUR OWN RISK. This work is licensed under a Creative Commons License. Okay, here are the schematics: pdf | postscript file | parts list (coming soon) And here are some potentially helpful links to cheap electrodes, electronics parts, resources, etc Here's what my baby looks like... OLIMEX. ModularEEG. General information The ModularEEG device is made up of two or more EEG amplifiers, and a 6-channel signal capture board that connects to a PC via a standard serial cable.
The standard setup has two EEG channels. As with any EEG device that you build yourself, there is a risk of injury involved. Make sure you read the WARNING file below. The cost of a complete system is 200 to 400 USD. General information (has ModularEEG sections) General Frequently Asked Questions. Design Documentation Project download at Sourceforge. Build Documentation Assembly section (Section 1) of Building instructions (a collective document) The Preparation, Acquiring the Parts, and Building the Circuits sections of A guide to building the ModularEEG by Dan Griffiths (under construction) Some ModularEEG photos by Nelo and Joe Street . Modification Design Modifications For those who want to do more than 2 channels, there are some documents for Multi-channel ModularEEG.
Parts Substitutions Kits Firmware. Brainclinics. Brainclinics is specialized in personalized medicine, applied neuroscience and neuromodulation techniques such as rTMS and Neurofeedback and is involved with scientific research in these fields.
We also regularly provide courses and workshops on these topics. On this section of the website you can find different products that are used in applying these techniques in practice. Within Psychology Practice Brainclinics and our Research Institute we use these equipment and products. Since we are often asked advice about different products and because we would like to share our experiences, we have provided more information on these pages about different types of equipment and products, which can also be ordered here.
Furthermore, under Neurofeedback Resources you can find several downloadable resources from different studies we conducted such as BioExplorer designs, meta-analytic data etc. Personalized Medicine Information about ordering products can be found here. J&J Engineering. QDS System. BioExplorer Software BioExplorer is a Windows program for real-time biophysical data acquisition, processing, and display.
It is intended for personal use in entertainment, education, and experimentation. BioExplorer version 1.3 is now available for download this version is needs the Hasp Key. The 30 days Demo Trial Version download link is listed below. Download BioExplorer demo: time limited trial version. www.cyberevolution.com System Requirements Windows 98, ME, 2000, or XP. You can get the latest version of DirectX here. MonolithEEG_e. ● miniaturised to 3.8 x 2.4 x 1 Inch (101 x 61 x 26mm) ● limited to 2 EEG channels each with 10 Bit resolution ● only one circuit board equipped with SMD components ● Designed for a Pactec JM 42-000 case ● USB via FTDI232 ● Supply voltage from USB ● complete galvanic isolation ● no shielding of the case necessary ● no shielding of the cables necessary ● Expansion port available on the outside ● Programming adapter integrated into the expansion port ● ATMega8 Controller by Atmel ● measurement lines connected via nine pin D-sub socket ● For experienced soldering virtuosi only ● Compatible with amonst others with ElectricGuru, BrainBay and Bioera.
OpenEXG. Last Updated: 21 April 2009 A 2-channel biometric signal amplifier for EEG and other biological signal processing. About the project ModularEEG has been around for some years. The car industry has progressed by about 1 and ½ car model generations during this period, technology moves on. ModularEEG is a well performing device and should still be the design of choice for beginners. Disadvantages of ModularEEG are the following: In today's RS232-less world, needing to fiddle with RS232-USB converters is clumsy;Having to use a wall-wart mains adapter is also a pain;The 10-bit resolution, although adequate, is on the low side.
EXG-2 is a modern, up-to-date design and has the following advantages: It is USB enable from out-of-the-box;It has 16-bit resolution and thus more dynamic range;Although technically advanced, it uses less components than ModularEEG;It has been designed to handle all biometric signals: EEG/ECG/EMG/EOG;It needs no wiring other than 5 short wires to the input connectors. Pceeg. ScEEG. Sound Card EEG (ScEEG) Technology This web site is focused on sound card EEG hardware and software experimentation to create a Brain-to-Computer Interface (BCI). Several types of EEG units have been built to date, a dual channel AM unit, a dual channel FM unit, A four channel AM unit, and a four channel multiplexed unit. The FM unit uses approximately 4.5 kHz of audio spectrum per channel while the AM unit uses approximately 2 kHz of spectrum (with some guard band allocation) per channel.
The first attempt in building a prototype sound card EEG unit was begun in July 2005 . The first unit consisted of a two channel AM modulated version with a built-in power supply. The second prototype was a single channel AM unit that reduced the modulation circuitry and the size of the unit was reduced to 2" by 4". A new software application (EEGProbe2) was developed specifically for EEG display and instrumentation. Single Channel FM Unit 1. 1 EEG signal channel 2. Two Channel AM Unit Two Channel FM Unit.