[FieldTrip] about overlap in PSD calculation

Ivano Triggiani ivano_triggiani at yahoo.it
Mon Sep 10 12:27:09 CEST 2012

Hi all.

How can I obtain informations about the kind of overlapping performed by fiedltrip implemented method to obtain a Power Spectral Density ? 

I need to compare fieldtrip PSD with another spectral density, so I need to be sure of everything. I found docs about tapering, but I don't understand if using a kind of tapering the overlapping is given.


"No man can wear one face to himself 
and another to the multitude,
without finally getting bewildered 
as to which one is true."

Nathaniel Hawthorne

 Da: "fieldtrip-request at science.ru.nl" <fieldtrip-request at science.ru.nl>
A: fieldtrip at science.ru.nl 
Inviato: Lunedì 10 Settembre 2012 12:00
Oggetto: fieldtrip Digest, Vol 22, Issue 17
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Today's Topics:

   1. Using WPLI od WPLI-debiased to do the coherence analysis
      (sahand babapoor)


Message: 1
Date: Sun, 9 Sep 2012 20:49:31 -0400
From: sahand babapoor <sahand.babapoor at gmail.com>
To: fieldtrip at science.ru.nl
Subject: [FieldTrip] Using WPLI od WPLI-debiased to do the coherence
    <CAPWLZVVY9oDYS9NuRceBvK0-++PcRe5p-Ni88+afmVdEMxa_1A at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Hi all,

I am trying to do coherency analysis between ACC and FEF. I have tried both
WPLI and WPLI-debiased methods to do the analysis. When I am using WPLI I
find a very nice coherence pattern between ACC and FEF in the frequencies
between ~11Hz to 20 Hz. However, when I am using WPLI-debiased method, the
previous WPLI coherence pattern disappears and  breaks into many sparse
clusters across many time points and frequencies. Is there a way to know
which method is the best for me. I should note that I am recording using
tungsten microelectrodes advanced into the brain. I would appreciate if
your help.

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