[Eeglablist] linear detrend in EEGLAB

[Arnaud Delorme]

Dear Jason,

detrend is not applied to your data epochs.
To detrend each epoch from the command line

for i = 1:EEG.trials, EEG.data(:,:,i) = detrend(EEG.data(:,:,i)')'; end;
[ALLEEG EEG CURRENTSET] = eeg_store(ALLEEG, EEG);
eeglab redraw

Best,

Arno

On 8 May 2013, at 04:04, Arndt, Jason D. wrote:

> Hello,
>  
> I am a relatively new user of EEGLAB. I am wondering if a linear detrend is being applied to my epochs. I have applied a detrend to remove the mean of the baseline period but it's not clear to me if a detrend is also being applied for the whole epoch. My late onsetting effects (~600 ms post-memory probe) look flatter than I would expect and the waveforms return to baseline earlier than I would expect for the study I am doing. In other EEG analysis programs I have used, the linear detrend is an option that can be applied on the epochs and it can be useful for examining early ERPs but I want to make sure it's not being implemented somewhere that isn't immediately clear to me.
>  
> Thank you,
>  
> Jason
>  
> Jason Arndt, Ph.D.
> Associate Professor of Psychology
> 5605 Middlebury College
> Middlebury, VT 05753
> Phone: 802-443-3404
>  
>  
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