[Eeglablist] isolating a CNV with ICA

[Keith Yoder]

We're running ICA on a raw, epoched dataset.  We've tried several different
latency windows: 0, 0.5 and 1 second before S1 and 0, 0.5 and 1 second after
S2.

On Tue, Sep 8, 2009 at 5:37 PM, Thomas Ferree <tom.ferree at gmail.com> wrote:

> Are you computing ICA on the raw data or the averaged ERP?
>
> On Tue, Sep 8, 2009 at 12:01 PM, Keith Yoder <kjyoder at gmail.com> wrote:
>
>> Hi all,
>> Our group has EEG time-series data collected with a BioSemi ActiveTwo
>> 128-electrode cap.  Our paradigm includes a Go-NoGo, with an alerting
>> stimulus (S1) preceding the presentation of the Go-NoGo stimulus (S2).  S1
>> and S2 are separated by 3 seconds.  When we examine ERPs from single
>> electrodes, we observe a typical contingent negative variation (CNV).
>>  However, when we run ICA (runica), none of the components isolate the CNV.
>>  We've tried highpass filtering at 0.5hz (obviously to high), 0.01hz and
>> without any highpass filtering, all without success.  Has anyone else run
>> into a similar problem?  Does anyone have any additional advice for
>> isolating a CNV with ICA?
>> Thanks,
>> Keith Yoder
>> --
>> Research Assistant
>> Belmonte Autism Lab
>> Cornell University
>>
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>
>
>
> --
> Thomas Ferree, PhD
> Department of Radiology
> UT Southwestern Medical Center
> Email: tom.ferree at gmail.com
> Voice: (214) 648-9767
>
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