[Eeglablist] Low Phase Locking Values

[Makoto Miyakoshi]

Hi Hannah,

   1. What's the measurement? What animal did you use, and from where did
   you record the signals, and what types of electrodes did you use?
   2. What's the task?
   3. Cross-frequency phase locking (i.e. phase-phase coupling?) < 0.1 may
   not be surprising.
   4. Generally speaking, you can make a comparison with minimally
   processed vs. highly process data to evaluate the impact of signal
   processing.

Makoto

On Sat, Jun 8, 2024 at 12:39 PM Kim,Hannah via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Dear EEGLAB community,
>
> I am trying to compute the phase locking value however, I am getting
> values lower than 0.1 from every data(18 animals, channels from both pre
> and post). Would you please look at the steps and tell me if I am doing
> something wrong?
>
> So, these are my steps:
> First, I import the mat file and change Sampling rate to 2000Hz. Then I
> set the channel locations. Then since I want to analyze the first 1 hour,
> from the select the data, I set the Time Range to be ‘0 3600’ and remove
> channels that are bad. Then I apply the notch filter using Tools > Filter
> the data > Basic FIR filter and set the lower edge to 59 and higher edge to
> 61 and click Notch filter the data instead of pass band. (I tried to use
> CleanLine but I am getting this error “Undefined function ‘finv’ for input
> arguments of type ‘double’”) After applying notch filter, I process ICA
> using Reject data using Clean Rawdata and ASR and deselect Process/Remove
> channels since I don’t want channel itself to be removed. These are the
> preprocess I do, and with the plugin PAC Tools, I am computing the Phase
> Locking Value. So with the Estimate PAC, I first choose all channels for
> both Phase data and Amplitude data. Then for the Freq range for Phase data,
> I set it as ‘4 8’ and for Amplitude data, I set it as ’30 100’.  Then I set
> # Frequencies to 1 for both with no log-scale. After these, I set the PAC
> method to compute as Phase Locking Value to compute the value.
>
> Thank you so much!
>
> Sincerely,
> Hannah Kim
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