[Mne_analysis] events timing problem

Denis-Alexander Engemann denis.engemann at gmail.com
Mon Dec 7 06:02:25 EST 2015
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mne.find_events is defined in mne,events.py
if you edit the function in events.py the documentation in mne.find_events
will change

--Denis

On Mon, Dec 7, 2015 at 11:57 AM, Elena Orekhova <orekhova.elena.v at gmail.com>
wrote:

> 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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