[Mne_analysis] events timing problem

[Elena Orekhova]

Sorry Alex,
this reference is to event.py.
It says:

    Parameters
    ----------
    events : ndarray
        Array as returned by mne.find_events.

Could it be better to put the comment into mne.find_events ?

Elena

On 7 December 2015 at 11:42, Alexandre Gramfort <
alexandre.gramfort at telecom-paristech.fr> wrote:

> hi Elena,
>
> fine with adding some info to the doc.
>
> you can do this by editing the file online:
>
> https://github.com/mne-tools/mne-python/edit/master/mne/event.py#L478
>
> thanks for your help.
>
> Alex
>
> On Mon, Dec 7, 2015 at 11:26 AM, Elena Orekhova
> <orekhova.elena.v at gmail.com> wrote:
> > 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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