Discovery 24E Evoked Potentials

Some users are interested in recording evoked potentials using Discovery.  There are several ways to do this, but they require some effort and knowledge on the part of the user.

To create the raw data, it is necessary to present stimulation pulses.  This can be done using the "Presentation" software available from:  http://www.neurobs.com/   using E-Prime from http://www.pstnet.com Or

Using this software to present stimuli, you can then send stimulus timing information to the Discovery via. a special cable (381-017) that connects the PC parallel port to channels 23 and 24 of the Discovery data.  Stim pulses then appear in one or both of these channels.  The cable is optically isolated for safety and noise immunity.

The resulting data including stimulation data, which is produced as "EDF" (European Data Format) files, can be read into one of several systems capable of computing and analyzing the evoked potentials.  Suitable software solutions include:

WinEEG:  http://www.novatecheeg.com/wineeg.html

MatLab:  http://www.mathworks.com/

EEGLab:  http://sccn.ucsd.edu/eeglab/

Persyst:  http://www.persyst.com/

 

You will have to set up or acquire files that perform the offline signal processing using one of these systems, or a similar system.  BrainMaster plans to develop and provide predesigned files to assist in this, in the future.

 For a live demo, see:

 

http://www.youtube.com/watch?v=esQPi_hJgLc

 

 

 

 

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