VEP

Known Issues and Problems with BCI2000
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Gagandeep kaur
Posts: 25
Joined: 27 Aug 2008, 02:17

VEP

Post by Gagandeep kaur » 17 Mar 2009, 15:46

Hello Grev,

Can VEP be used to accomplish BCI ?

Gagan

gschalk
Posts: 615
Joined: 28 Jan 2003, 12:37

SEP

Post by gschalk » 17 Mar 2009, 22:30

Gagan,

There are a number of SSVEP-based BCIs. You can check papers by Shangkai Gao, Brendan Allison, A. Curran, and Len Trejo.

Gerv

Gagandeep kaur
Posts: 25
Joined: 27 Aug 2008, 02:17

Thanks

Post by Gagandeep kaur » 18 Mar 2009, 09:16

Thanks Again Gerv.

Gagan

Gagandeep kaur
Posts: 25
Joined: 27 Aug 2008, 02:17

VEP

Post by Gagandeep kaur » 12 Apr 2009, 08:17

Hello Sir,

I found the following experiment to produce VEPs . i cant make out if the stimuli is Patterned or unpatterened. I need to know this since otherwise i cannot figure out whether the response that will be generated later be SSVEP or Flash VEP.
Quote:
In this experiment, there were two types of events "square" and "rt", "square" events corresponding to the appearance of a green colored square in the display and rt to the reaction time of the subject.

The square could be presented at five locations on the screen distributed along the horizontal axis.

Here we only considered presentation on the left, (at about 3 degree and 1.5 degree of visual angle respectively).

In this experiment, the subject covertly attended to the selected location on the computer screen responded with a quick thumb button press only when a square was presented at this location.

They were to ignore circles presented either at the attended location or at an unattended location.


Thanks
Gagan

gschalk
Posts: 615
Joined: 28 Jan 2003, 12:37

SSVEP ...

Post by gschalk » 12 Apr 2009, 11:09

Gagan,

The configuration of stimuli for SSVEP-based BCIs is described in detail in:

Towards an independent brain-computer interface using steady state visual evoked potentials
Allison, Schalk et al.
J Clin Neurophysiol, 2007


Gerv

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