[FieldTrip] ft_spiketriggeredaverage

[María Alejandra Korovaichuk]

Many thanks Arjen, yes I think the problem is there. I'll try different
options. One more question, I assume the first timestamp is the first
"theoretical" timestamp (I mean: 0 or 1, the first timestamp or temporal
point in the recording) Or the first timestamp belongs to the first neuron
firing during the recording?
Thanks again!

El mar., 19 mar. 2019 a las 19:30, Arjen Stolk (<a.stolk8 at gmail.com>)
escribió:

> Dear Alex,
>
> Wave_clus typically outputs the timestamps in milliseconds, where the
> first timestamp is the original first timestamp, not necessarily 1. This
> implies that you'll have to find out how the samples of the spike2 and
> wave_clus outputs relate to one another and adjust either the timing of the
> imported wave_clus file or of your data_lfp structure. For example, our
> Neuralynx system 'thinks' in microseconds, irrespective of the chosen
> sampling frequency. This means that the wave_clus timestamps would need to
> be multiplied by 1000 to convert them back to Neuralynx timestamps. Hope
> this gets you going,
>
> Arjen
>
> On Mon, Mar 18, 2019 at 9:47 AM María Alejandra Korovaichuk <
> alejandra.korovaichuk at ctb.upm.es> wrote:
>
>> Dear all,
>>
>> I am trying to use the STA function to calculate the average of the LFP
>> around the spikes. The LFP was recorded with an intracranial system (not
>> supported by FT directly), so I used Spike2 software to open the file, I
>> select the LFP channels and save it as a .mat file. I can use the file
>> perfectly in FT. In the other hand, the spikes were sorted and save  with
>> wave_clus as a .mat file.
>> I can open and analyze both file independently and even merge them as one
>> structure.
>> But the problem arises when I try to see the relationship between the LFP
>> and the spikes with ft functions as ft_spiketriggeredaverage. The data and
>> the figure looks as  they are not synchronized among them at all.
>>
>>
>> I can't do a read_header with spike2 files (I have the error "unsopported
>> ced6 format"), I built the hdr info by myself:
>> data_lfp.hdr = []
>> data_lfp.hdr.Fs = 20kHz;
>> data_lfp.hdr.nSamples = nsamples (in this case 1000 sec means 20000000
>> samples)
>> data_lfp.hdr.FirstTimeStamp =1;
>>
>> There is any other way to synchronized a continuous LFP with spike data?
>>
>> It is possible that I have an issue with the timestamps reading?
>>
>> Thanks in advance,
>>
>> Alex
>>
>>
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