The Internet Meets the Neural Net

orangesquid writes "OpenEEG is a system for getting data from your brain to your computer. Recently, work was resumed on scEEG, a soundcard-based system which may one day make home EEG systems very cheap (they currently cost a few hundred US$ to put together; there are, though, some potential cheaper alternatives). But, what research is being done into getting data from your computer to your brain? There have been some systems that inject optical signals into your eyes, but, what about direct neural interfacing? It seems EMF and light are one option; playing with neurotransmitters may be another. What do /.'ers foresee coming in this field? What research have you seen being done? Particularly, is any of this to the point where homemade, low-cost systems are feasible? Where can I find out how to inject signals into my head? Combining this with openEEG might lead to some exciting new levels of Internet addiction."

Comments

Re:Critical that it stays Open Source

[alienw]

Whatever. As someone who has some experience with neurobiology, it is very unlikely you can actually get anything useful from EEG signals. They are totally useless for exploring the brain's functions. Sorry to burst your bubble, but even microelectrode arrays implanted directly into the brain don't provide anything too interesting. At best, you might see a different firing pattern based on external stimulus, and even that is rare.

Re:Critical that it stays Open Source

[natrik]

Early tests with monkeys indicate great progress in controlling a robotic arm with a monkey.

The monkey is in a room looking at a screen, and thinks ... the picture on the screen changes position according to the monkey's mind. A robotic arm is also controlled, and the screen and arm basically do the same things as a result of the monkey "wanting" it to. ... and that's just a monkey!

Google it: robot arm monkey brain

Information Injection

[cr0sh]

Getting information out of the brain is going to be difficult at best - as others have noted, it is a very noisy output on the best of days. Filtering the noise, etc - tough, though not impossible to do. What is difficult is analysing the results (the brainwave plots). I remember an old Steve Ciarcia Workshop column or book (late 70's - early 80's) that detailed building your own EEG machine using cheap high-gain op-amps (designed for this work, with isolation and such - when you are dealing with electricity around the brain, you need safety above all else) - I can't remember, but I wouldn't be surprised at all if he didn't show how to interface it with an S-100 bus computer...

Now, getting data into the brain, that would be easier. We have two main, "high bandwidth" conduits for input; the eyes and the ears. First off - look up "brainwave stimulation", "light and sound", etc - here's a few links:

Hack Canada's Brain-Wave Machine
Futuremind Light & Sound
Neural Signals, Inc

There are other projects out there as well - just google, and you will find them.

Also - look into "Neurophone" and "Voice to Skull" technologies - these use two systems: ultrasound and microwave. Of the two, microwave seems to offer direct neuron stimulation. Basically, on both systems, a carrier wave is set up and voice is FM modulated on top of the carrier wave. The signal is beamed to the subjects head. In the ultrasound version, the skull filters out the carrier wave, leaving the original signal, and bone conduction allows the subject to "hear" the original sound. In the microwave system, the brain itself does the filtering, and the brain then reconstructs the sound. Both systems suffer from major drawbacks in sound quality. Both versions are patented. NASA at one time was interested in the research. Basically, to the subject, it sounds like voices are speaking in their heads - and in the case of microwaves being used as the transmission medium (the research originally started when radar and microwave technicians reported hearing "clicking" type noise whenever they worked on live equipment), it makes you wonder about wearing tinfoil hats (hmmm). I know that the ultrasound version has recently been used as a testbed for "beaming" custom music or advertisements to people on an individual basis - I know /. stories have reported on this in the past (heck, you will find my comments in them on voice to skull).

Anyhow - once you have a couple of ways to get data into the eyes and ears (and/or vestibular system) - and note, a good quality HMD could be used as a light/sound device - you then can play. I can see using the sound part to play music, and underneath the music have the sound binaural beat doing the brain-wave thing (basically, what you do is inject two different audio signals into the ears - say the left at 30 Hz, and the right at 36 Hz - which will yield a "beat tone" of around 6 Hz, which will make you drowsy, etc). Get the sound going, and sync up the eyes in a similar matter, to the sound. Maybe monitor (via IR leds and a camera) the eyes, see what they do, and if you can tell when you are in the meditative state - then alter the sound and/or visuals to force something different (say, ramp slowly from 10 Hz to 6 Hz - then hold at 6, then ramp quickly up to 7-8 Hz, injecting crazy patterns into the eyes - if using an HMD, maybe something like a visualization hack).

Another thing or possibility would be the idea of computer controlled or directed lucid dreaming, via a brain-wave system - imagine donning the goggles and headphones, lying back, listening to a relaxing audio CD as the computer drops you down to a lucid dreaming state, then starts putting suggestions into your ears and eyes, suggesting and guiding a lucid dream (perhaps the computer could also monitor breathing rate, skin conductivity, etc - to help control the "dream")...

Fascinating thoughts and ideas...