[Eeglablist] components direction in CNT and EEGLAB

[Scott Makeig]

I believe there is a switch you can set in your local copy of 'icadefs.m'
that defines the plotting polarity in EEGLAB functions - correct, Arno?

Scott

On Fri, Jul 13, 2012 at 5:28 AM, Ruud Kalis <rkalis at ant-neuro.com> wrote:

> Dear Malahat,
>
> The default setting in the ASA software is with negative polarity up.
> There is a possibility to switch between negative and positive up. Since
> this does not concern EEGLAB, I will send you a separate email with
> instructions how to perform this.
>
> Best regards,
> Ruud
>
> ----- Original Message -----
> From: "Arnaud Delorme" <arno at ucsd.edu>
> To: "malahat akbarfahimi" <malahatfahimi at gmail.com>
> Cc: eeglablist at sccn.ucsd.edu
> Sent: Friday, 13 July, 2012 6:52:10 AM
> Subject: Re: [Eeglablist] components direction in CNT and EEGLAB
>
> Dear Malahat,
>
> some researchers like to visualize ERP with negative polarity up. You can
> do it as well in EEGLAB but this is not the default. I think this is where
> you confusion comes from. There has been heated debates as to wether this
> old convention (negative going up) should be kept. It is tending to
> disappear slowly.
>
> Best regards,
>
> Arno
>
> On Jun 28, 2012, at 2:06 AM, malahat akbarfahimi wrote:
>
> > Hi,
> > I am working on face perception with ERP. My EEG records were by ANT and
> I sure the direction of P300 in down , but after we processing these
> signals with EEGLAB is it possible the direction were changed, is it
> possible that  in EEGLAB  codes  that changed the direction of ANT or CNT
> files as a standard forms (ex P300 showed in up direction)?  I really
> confused and check all possible events but the cons and pons are
> equal.appreciate any help.
> > thanks
> > --
> > Malahat Akbarfahimi
> > Occupational Therapist-PhD Student of cognitive neuroscience
> > Faculty Member
> > Occupational Therapy Department-Rehabilitation Faculty
> > Tehran University of Medical Science
> > Iran-Tehran
> >
> >
> >
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> --
> Ruud Kalis
> Sales and Support Germany
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-- 
Scott Makeig, Research Scientist and Director, Swartz Center for
Computational Neuroscience, Institute for Neural Computation; Prof. of
Neurosciences (Adj.), University of California San Diego, La Jolla CA
92093-0559, http://sccn.ucsd.edu/~scott
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