[Eeglablist] Using discontinuous baseline region in epochs for wavelet analysis

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Thu Feb 9 19:22:32 PST 2017

Dear Julian,

I hear this from time to time. My opinion is that use whichever the longer
one to epoch everything.

Under special cases where it matters, you can still separate data (after
epoching) into the conditions that have different data length (which is not
recommended at all).

If you think about how wavelet slides on data, you'll see it is meaningless
to worry about epoch overlap etc. Wavelet transform itself is super


On Mon, Feb 6, 2017 at 5:04 PM, Julian Yaoan Cheng <jycheng0 at stanford.edu>

> Hi all,
> Suppose we have the following 2 trials types:
> Type 1: 1 second cue -> 6 second delay
> Type 2: 1 second cue -> 0.5 seconds fixation -> 1 second cue -> 6 second
> delay
> We would like to analyze the 1 second of cue immediately prior to the
> 6-second delay, but use the 600ms before the first cue onset as baseline.
> This causes epochs from trial type 2 to have a discontinuity between the
> baseline and the cue period of interest.
> I'm stuck not knowing how to epoch because each dataset cannot have
> different epoch lengths, but if I use different datasets then I can't do a
> wavelet analysis of trial type 1 vs type 2.
> Thanks,
> Julian
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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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