[Year 12 IT Apps] NASA brain-computer interfaces

[Timmer-Arends]

Very interesting stuff and it will be intersting to see where it goes.

ABC RN's "All in the mind" ran a story called "the Brain Computer Interface" 
a few weeks ago. Similar stuff but medical use.

http://www.abc.net.au/rn/allinthemind/stories/2006/1799619.htm

Regards
Robert T-A

----- Original Message ----- 
From: "Stephen Loosley" <stephen at melbpc.org.au>
To: <link at anu.edu.au>
Cc: <oz-teachers at cobia.ed.qut.edu.au>; <itapps at edulists.com.au>
Sent: Tuesday, January 02, 2007 2:47 AM
Subject: [Year 12 IT Apps] NASA brain-computer interfaces


> Hi all,
>
> The NASA Intelligent Systems Division (http://ti.arc.nasa.gov/)
> are sponsoring some interesting research.  One recent report
> depicts two 'brain-computer interfaces' called 'Target Practice'
> (of course) and 'Think Pointer'. Both apparently work quite well:
>
> "Brain-computer interfaces for 1-D and 2-D cursor control: designs using 
> volitional control of the EEG spectrum or steady-state visual evoked 
> potentials."
>
> Trejo LJ,  Rosipal R,  and Matthews B.  NASA Ames Research Center, Moffett 
> Field, CA 94035, USA. ltrejo at quasarusa.com
> Published: IEEE Trans Neural Syst Rehabil Eng. June 2006.
>
> We have developed and tested two electroencephalogram (EEG)-based 
> brain-computer interfaces (BCI) for users to control a cursor on a 
> computer display. Our system uses an adaptive algorithm, based on kernel 
> partial least squares classification (KPLS), to associate patterns in 
> multichannel EEG frequency spectra with cursor controls.
>
> Our first BCI, Target Practice, is a system for one-dimensional device 
> control, in which participants use biofeedback to learn voluntary control 
> of their EEG spectra. Target Practice uses a KPLS classifier to map power 
> spectra of 62-electrode EEG signals to rightward or leftward position of a 
> moving cursor on a computer display.  Three subjects learned to control 
> motion of a cursor on a video display in multiple blocks of 60 trials over 
> periods of up to six weeks. The best subject's average skill in correct 
> selection of the cursor direction grew from 58% to 88% after 13 training 
> sessions..
>
> The second BCI, Think Pointer, is a system for two-dimensional cursor 
> control. Steady-state visual evoked potentials (SSVEP) are triggered by 
> four flickering checkerboard stimuli located in narrow strips at each edge 
> of the display. The user attends to one of the four beacons to initiate 
> motion in the desired direction. The SSVEP signals are recorded from 12 
> electrodes located over the occipital region. A KPLS classifier is 
> individually calibrated to map multichannel frequency bands of the SSVEP 
> signals to right-left or up-down motion of a cursor on a computer display. 
> The display stops moving when the user attends to a central fixation 
> point..
>
> Training of the classifier requires about 3 min.. Across subjects and 
> sessions, control accuracy ranged from 80% to 100% correct with lags of 
> 1-5 s for movement initiation and turning.   We have also developed a 
> realistic demonstration of our system for control of a moving map display.
> (PMID: 16792300)
> --
>
> Cheers all ..
> Stephen Loosley
> Melbourne, Australia
> .
>
>
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