[Eeglablist] Removal of distortion due to overlapping ERP responses - ADJAR filter

Caspar M. Schwiedrzik schwiedrzik at mpih-frankfurt.mpg.de
Thu Oct 7 07:33:32 PDT 2010


Hi everyone,
we would also be very interested in a Matlab implementation of ADJAR.
Thanks and kind regards,
Caspar M. Schwiedrzik



2010/8/2 Niko Busch <mail at nikobusch.net>:
> Hi everyone,
>
> I am looking for a way to remove the distortion from an ERP waveformthat is due to overlapping ERP responses to different events. I willemploy an experimental paradigm in which an experimental event A isfollowed by an event B after a variable SOA on each trial. My interestis in the ERP evoked by the Bs. However, the resulting ERP waveform -time-locked to event B - will be "contaminated" by the responses to theAs.
>
> It seems that people use two different approaches to remove the contribution of the As:
> 1. Include trials with A events only and then subtract the average of A from the average of A+B.
> 2. A convolution approach - the ADJAR method specified in this paper:
>
> Woldorff MG. Distortion of ERP averages due to overlap from temporallyadjacent ERPs: analysis and correction. Psychophysiology. 1993Jan;30(1):98-119.
>
> Has anyone implemented ADJAR or something similar in Eeglab/Matlab andis willing to share the code? Any help would be very much appreciated!
>
> Best,
> Niko
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