[Eeglablist] BCI approach

[Jorge Alvoeiro]

Dear Ali Erfani,

I read your e-mail below, and one question which got my mind going
was how are you going to get EEG patterns during imagery tasks 
specific to hand movements?

A visual cue do not seem to be a good trigger for this because
as soon as one closes one's eyes and tries to imagine a movement
there is a delay, which is dependent upon each person. This produces
a mixture of EP for closing one's eyes and the EEG for some activity 
which you do not know if it is the imagery of the movement or 
something else.

If you want more information on imagery and motor activity
have a look at the site pointed out below and open
the dissertation on imagery and motor activity.

All the best.
Jorge Alvoeiro, PhD
-------
Prof. Dr.  Jorge Alvoeiro, Ph.D., Hull, UK,
C.Psychol., BPS, UK,
LabPsiCog,
2000-119 Santarem
Portugal
http://www1.terravista.pt/Enseada/8146/
  ----- Original Message ----- 
  From: ALI ERFANI 
  To: Eeglablist at sccn.ucsd.edu 
  Sent: 03 June 2003 21:47
  Subject: [Eeglablist] BCI approach


  Hi there

  I am trying to classify EEG patterns during hand movement imagination tasks.

  To this aim, subjects are seated against computer monitor and start to imagine with the presentation of a visual cue.

  Since for the BCI approach, electrode minimization is suggested to be a practical system. We use only seven electrode to record signals.

  Eye blink artifacts is rejected by adaptive nonlinear filtering.

  I am trying to enhance electrode signals by ICA technique. But due to small number of electrodes ICA result is poor.

  I have some questions :

   

  1- Can I make a ERP template pattern with averaging of (for example) ten trials then run ICA orver averaged sinal and apply obtained ICA weights on single trials for ERP filtering? (to improve SNR .)

   

  2- Do adaptive filtering for rejecting eye blink (with reference electrode) degrade ICA performance?

   

  I should grateful if you send me any comment. 

  Thanks. Ali erfani.

      

  e-mail: erfanish at yahoo.com



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