[Eeglablist] Epoch time-range for Time-frequency decomposition

[Makoto Miyakoshi]

Dear Akshay,

> How valid or how accurate would a time-frequency decomposition be with
epochs time range of -0.1 to 0.8 sec?

If you can give up whole theta range and start from 8Hz, namely 'freqs', [8
50], you can still use the wavelet transform with compatible parameters.

> However, if I go for this, there will be overlapping events.

It's fine to have overlapping events within the epoch as long as they are
moderately separated. For example, it's fine to use 'cycles', [3 0.85],
'freqs', [8 50] (this makes 1117ms window length) for MMN paradigm in which
SOA is 500 ms.

Makoto

On Sun, Oct 18, 2015 at 9:20 PM, Akshay Maggu <akshaymaggu86 at gmail.com>
wrote:

> Hi all,
>
> How valid or how accurate would a time-frequency decomposition be with
> epochs time range of -0.1 to 0.8 sec? As I read (
> http://sccn.ucsd.edu/wiki/Makoto's_preprocessing_pipeline), -1 to 2 sec
> epochs is what is recommended for a TFD. However, if I go for this, there
> will be overlapping events.
>
> Has anyone done a TFD with epoch time-ranges shorter than -1 to 2 sec?
>
> Thanks,
> Akshay
> --
> Akshay Raj Maggu,
> PhD Candidate,
> Laboratory for Language, Learning and the Brain,
> Department of Linguistics and Modern Languages,
> The Chinese University of Hong Kong,
> Hong Kong.
> Webpage: http://www.cuhk.edu.hk/lin/new/people/students/maggu/
> *Save trees.. Save life! Please don't print this email unless you really
> need to.....*
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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