[Eeglablist] question about the ERSP and ITC

[Makoto Miyakoshi]

Dear PengMin,

> 1. If I still want to get the information within the bandpass 3-30Hz, how
can I set up the base?

If you want to go down to 3 Hz with 3 cycles, it's recommended that you
have 3 second long epoch (-1 to 2 sec, typically). This is because 3Hz
3cycle is 1 sec, which means you apply 1 sec long sliding window to your 3
sec epoch to generate 2 sec long wavelet transformed data.

> 2. If I use the 200ms prestimulus as base, what is the high-pass for the
bandpass? Is 5Hz ok?

I don't understand this question.
For high-pass filter the data we recommend 1 Hz (which is 0.5 Hz at -6dB).
For low-pass, typically it is 15-30 Hz. 5 Hz high-pass sounds crazy for
general-purpose EEG analysis. It'll wipe out your P300 etc.

Makoto



2013/10/10 PengMin Qin <qin.pengmin at gmail.com>

> Dear all,
>
>  My epoch lasts 1100ms including prestimulus interval 200ms.
>
> I intend to see the ERSP and ITC within the bandpass 3-30 Hz. I calculated
> the ERSP/ITC by using the 200ms prestimulus interval as base. It seems to
> be not good for the low frequency. So I have two questions:
>
> 1. If I still want to get the information within the bandpass 3-30Hz, how
> can I set up the base?
> 2. If I use the 200ms prestimulus as base, what is the high-pass for the
> bandpass? Is 5Hz ok?
>
> Looking forward to your suggestions!!
>
> Best,
> Pengmin
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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