[FieldTrip] Using PPC method

[Julia Coopi]

Dear Andreas,

Finally, I managed to get PPC result from fliedtrip, now I have a problem:
I am using mtmfft as method I wnat to have fine frequency resolution
atleast I wan to have a point for each 1 hz. I have used
 cfg.foi       =2:1:80;

But it did't work, my output has a frequncy vector like this:[ 5 10 15 20
... 80];

do you have any suggestion for better frequency resolution.
If any body has a suggestion, that woulb be great to share it.

Thanks,
Julia

On Mon, Sep 4, 2017 at 6:24 AM, Andreas Wutz <awutz at mit.edu> wrote:

> Dear Julia,
>
> I did not see your error message. Maybe, your lfp data structure is still
> in a continuous recording format without a trial definition?
>
> ------------------------------
> *From:* fieldtrip-bounces at science.ru.nl [fieldtrip-bounces at science.ru.nl]
> on behalf of Julia Coopi [juliacoopiza at gmail.com]
> *Sent:* Sunday, September 03, 2017 11:14 AM
>
> *To:* FieldTrip discussion list
> *Subject:* Re: [FieldTrip] Using PPC method
>
> Dear Andreas,
>
> Thanks for your response, I am going through your suggestion. did you have
> any problem regarding the appending spikes and lfp. I got this error:
>
> Error using ft_appendspike (line 112)
> could not find the trial information in the continuous data
>
> thanks.
> Julia
>
> On Mon, Aug 28, 2017 at 4:55 PM, Andreas Wutz <awutz at mit.edu> wrote:
>
>> Dear Tianyang,
>>
>> maybe it's a good idea to download the accompanying sample data from the
>> tutorial and look if you can recreate the shown data structure. Then look
>> closer into the values of the respective fields. That should give you a
>> better grasp on what is required there.
>>
>> I have not fully looked into the code but my feeling is that
>> spikeTrials.timestamp is not of any further use and is just carried from
>> the data structure before (which was not cut into trials and where the raw
>> timestamps were useful). The timing of spikes relative to the trial zero
>> point is fully described in the fields ".time", ".trial" and ".trialtime".
>> Best,
>> Andreas
>>
>>
>> *From:* fieldtrip-bounces at science.ru.nl [fieldtrip-bounces at science.ru.nl]
>> on behalf of 马天阳 [tianyangma2013 at gmail.com]
>> *Sent:* Monday, August 28, 2017 5:31 PM
>> *To:* FieldTrip discussion list
>> *Subject:* Re: [FieldTrip] Using PPC method
>>
>> Dear Andreas,
>>
>> I still don't quite understand the tutorial.
>>
>> spikeTrials =
>>          label: {'sig002a_wf'  'sig003a_wf'}
>>      timestamp: {[1x83601 int32 <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/int32.html>]  [1x61513 int32 <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/int32.html>]}
>>       waveform: {[1x32x83601 double <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]  [1x32x61513 double <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]}
>>           unit: {[1x83601 double <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]  [1x61513 double <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]}
>>            hdr: [1x1 struct <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/struct.html>]
>>         dimord: '{chan}_lead_time_spike'
>>            cfg: [1x1 struct <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/struct.html>]
>>           time: {[1x83601 double <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]  [1x61513 double <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]}
>>          trial: {[1x83601 double <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]  [1x61513 double <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]}
>>      trialtime: [600x2 double <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]
>>
>> Like here, I don't know why for timestamp,time and trial, there are same number of values. If I have one unit, 60 trials and focus on -0.5 s to 0.5 s around stimulus event, I think trial means which trial of the 60 trials has spikes in this 1 s. The time means time point of spikes located in the 1 s around stimulus for each trial. Is it correct? But what about the timestamp? It means from the beginning of recording to the end and has nothing to do with trials?
>>
>> I feel I am quite lost.
>>
>> Best,
>>
>> Tianyang
>>
>>
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