[Eeglablist] ERSP Analysis Question

[Makoto Miyakoshi]

Dear Jeff,

When epoch your data, use your entire ISI so that when you concatenate the
epochs you reproduce the continuity. Then use this solution (attached)
twice to concatenate the epochs, and extract -1 to 2 sec epoch. This will
make your data redundant but works well for ERSP/ITC.

We use Morlet, so for obtaining a good ERSP/ITC we recommend you use lowest
3 Hz at 3 cycle which gives you 1116 ms window length, so you'll need -1 to
2 sec epoch length.

Makoto

2013/3/22 Boissoneault, Jeff <jboissoneault at ufl.edu>

>  Hello All,****
>
> ** **
>
> Our lab recently transitioned from NeuroScan’s proprietary suite to
> MATLAB/EEGLAB, and I feel comfortable using the software for ERPs. However,
> we would like to examine event related spectral perturbations in 1 s epochs
> (w/ 200ms baseline) extracted from recordings taken during a working memory
> task. The task consists of three trial blocks which vary by instruction
> set. The sampling rate is 500 Hz. In particular, we’d like to compare late
> alpha power from 500-650 ms and early gamma power from 100-200 ms between
> the three blocks. ****
>
> ** **
>
> I would really appreciate any insight into how we might best conduct the
> ERSP analysis. Thanks in advance for any help!****
>
> ** **
>
> -- ****
>
> Jeff Boissoneault, Ph.D.****
>
> Postdoctoral Associate****
>
> Department of Psychiatry****
>
> University of Florida****
>
> ** **
>
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-- 
Makoto Miyakoshi
JSPS Postdoctral Fellow for Research Abroad
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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