[FieldTrip] fieldtrip Digest, Vol 152, Issue 5

[Bence Szaszkó]

Dear Robert, 

Thank you for your answer. I got the file from colleagues who claim to have gotten it from BioSemi. However, when looking at the topoplots, it seems that channel positions are correct, so I guess this was not the source of the problem :) 

Kind regards,
Bence
-- 
Bence Szaszkó, BSc MA MSc
University Assistant (prae doc)

Vienna Doctoral School CoBeNe 
PhD Representative

University of Vienna
Faculty of Psychology
Department of Cognition, Emotion, and Methods in Psychology

Liebiggasse 5
A-1010 Wien/Vienna
Austria

e-mail: bence.szaszko at univie.ac.at

> Am 15.07.2023 um 12:00 schrieb fieldtrip-request at science.ru.nl:
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>   1. Re: ERPs "the other way round" (Oostenveld, R. (Robert))
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Fri, 14 Jul 2023 11:18:30 +0000
> From: "Oostenveld, R. (Robert)" <robert.oostenveld at donders.ru.nl>
> To: FieldTrip discussion list <fieldtrip at science.ru.nl>
> Subject: Re: [FieldTrip] ERPs "the other way round"
> Message-ID: <2D67428E-D1AD-487B-A978-DD4019F7778C at donders.ru.nl>
> Content-Type: text/plain; charset="utf-8"
> 
> Dear Bence,
> 
> Where do you get the electrode positions from that you find in your data.elec.chanpos? I don’t believe those are read from the BDF file, and we don’t include a templatein FieldTrip for the 3D locations corresponding to the Biosemi electrode caps. If you go to https://urldefense.com/v3/__https://www.biosemi.com/headcap.htm__;!!HJOPV4FYYWzcc1jazlU!5mHOs_kqWRej8db0vZpBoOxGy13wpWoE12YLTElAhZeE0mRka2mVvdEQ-8ffAdDAg72kZJ0rolT-XQeouNnMF3nnk3jz7rIQ4oADog$  you can see how the channel names map on to the position of the electrodes over the left and right hemisphere and there you can also find an excel file with positions, which includes a definition of x, y and z.
> 
> best
> Robert
> 
> 
> 
> 
> 
> On 13 Jul 2023, at 00:40, Bence Szaszkó via fieldtrip <fieldtrip at science.ru.nl> wrote:
> 
> Dear Group Members,
> 
> I am struggling a bit with an ERP analysis in Fieldtrip - calculating distractor positivity (Pd), I subtracted ipsilateral from contralateral effects. I get an effect, but exactly the opposite as expected. I looked at my code multiple times and did not find any mistakes.
> 
> However, when looking at channel positions in data.elec.chanpos, it appears that the coordinates for Biosemi 128 are „flipped“ between X and Y, so instead of XYZ it is YXZ. Is this common or could this be the reason for my results?
> 
> Kind regards,
> Bence
> 
> --
> Bence Szaszkó, BSc MA MSc
> University Assistant (prae doc)
> 
> Vienna Doctoral School CoBeNe
> PhD Representative
> 
> University of Vienna
> Faculty of Psychology
> Department of Cognition, Emotion, and Methods in Psychology
> 
> Liebiggasse 5
> A-1010 Wien/Vienna
> Austria
> 
> e-mail: bence.szaszko at univie.ac.at
> 
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