[Mne_analysis] events timing problem

[Elena Orekhova]

Thank you!
When I add the raw.first_samp, the latency is correct.
However, it is a bit confusing since the mne.find_events help states that

'The first column contains the event time in samples...'
and says nothing about that it is not from the first raw data sample (i.e.
the moment when the MEG record button) was pressed.
It might be good to put some comment on that.

Best, Elena

On 7 December 2015 at 11:15, Alexandre Gramfort <
alexandre.gramfort at telecom-paristech.fr> wrote:

> hi Elena,
>
> did you try to plot your stim channel?
>
> events are also defined taking into account the first_samp attribute.
>
> See raw.first_samp
>
> HTH
> Alex
>
>
> On Mon, Dec 7, 2015 at 10:56 AM, Elena Orekhova
> <orekhova.elena.v at gmail.com> wrote:
> > Dear mne experts,
> >
> >
> >
> > I record MEG with 5000 Hz sampling rate.  My 1st event [198] is around
> 17.3
> > sec from the beginning of the file (as I can see it in the
> mne_browse_raw),
> > while the events I obtain using  mne.find_eventscontain contain very
> > different values:
> >
> >
> >
> > array(   [[ 553744,       0,     198],
> >
> > [ 559801,       0,       1],
> >
> > [ 565846,       0,       1],
> >
> > …
> >
> > It means that the 1st event is at 553744/5000 = 110.7488 sec
> >
> >
> >
> > The events were obtained as:
> >
> > events= mne.find_events(raw, stim_channel='STI101', consecutive=True,
> > verbose=True, shortest_event=1, output ='onset' )
> >
> >
> >
> > Why event times do not correspond to what I see at the trigger channel?
> >
> >
> >
> > Thank you,
> >
> > Elena
> >
> >
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