[Eeglablist] contrast single-condition ersp/erp with baseline/zero: statistics

[Makoto Miyakoshi]

Dear Simon,

> My basic question is: what ERP/ERSP does my sound presented during sleep
evoke?

What an interesting question!

> To compute statistics, eeglab requires two conditions. How can I perform
a one-sample test against zero or the baseline?

It's better to use statcond() to perform one sample T test. If you have
trouble extracting data from EEGLAB data structure let us know.

Makoto

On Tue, Sep 15, 2015 at 1:25 AM, Simon Ruch <simon.ruch at psy.unibe.ch> wrote:

> Hello
>
> I would like to contrast my evoked potentials/perturbations against the
> pre-stimulus baseline, respectively against zero (for baseline corrected
> data). I would like to perform significance tests that tell me
> where/when/at what frequencies the signal peaks. My basic question is: what
> ERP/ERSP does my sound presented during sleep evoke? To compute statistics,
> eeglab requires two conditions. How can I perform a one-sample test against
> zero or the baseline?
>
> My approach so far:
> I created a dummy dataset as zero-control condition for each participant.
> In this dataset:  EEG.data(:,:,:) = 0. I used these datasets to create a
> repeated measures study design (stimulus vs. zero condition) and
> precomputed study parameters. In the spectral data generated for the
> control condition files (*.datersp), I replaced all NaNs with zeros and set
> the baseline (chanX_erspbase) to the baseline of the real data of the
> respective participant. This allowed me to perform tests against the
> baseline for both ERPs and ERSPs
>
> While this works fine, I was wondering if there is an easier and more
> elegant approach to what I want.
>
> Kind regards
> Simon Ruch
> --
>
>
> ________________________________________________
>
> *Simon Ruch, Dr. phil.*
> University of Bern
> Department of Psychology, Division of Experimental Psychology and
> Neuropsychology
> Center for Cognition, Learning and Memory (CCLM)
> Office A 362
> Fabrikstrasse 8
> CH-3012 Bern
> Switzerland
> Phone +41 (0)31 631 37 29
> mailto:simon.ruch at psy.unibe.ch <simon.ruch at psy.unibe.ch>
> http://www.apn.psy.unibe.ch/content/team/henke/
> http://www.cclm.unibe.ch/
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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