[FieldTrip] Using PPC method

Julia Coopi juliacoopiza at gmail.com
Sun Sep 3 17:14:06 CEST 2017

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


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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