[Eeglablist] wavelet cycle sorting trials by phase value

[Makoto Miyakoshi]

Dear Zhenzhu,

A 10 Hz sine wave has one positive peak and one negative peak. This is
called a cycle. You also know how long this one cycle is, because 10
Hz means 10 peaks & troughs per second by definition. Therefore, 1000
ms / 10 = 100 ms length is one cycle of 10 Hz wave.

Now your wavelet has 3 cycles of 10 Hz. 1 cycle of 10 Hz is 100 ms as
we have seen above. If we have 3 cycles, the length is simply 100 ms *
3 cycles = 300 ms.

Makoto

2012/8/15 Zhenzhu XU <xuzhenzhu2010 at 163.com>:
>
> hello，
>
> IN the manual of ‘Sorting Trials in an ERP by Phase Value ‘
>
> Noted:
>
> In this computation, a 3-cycle 10 Hz wavelet was applied to a window in each
> trial centered at time 0. The width of the wavelet was 300 ms (i.e., three
> 10-Hz cycles of 100 ms). Therefore, it extended from -150 ms to 150 ms.
>
> I wonder what the wavelet cycle means here ?and  why ‘3-cycle 10 Hz
> wavelet(center 0) is 300ms?
>
> Could you give me some more reference?
>
>
>
>
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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