[Mne_analysis] events timing problem
Elena Orekhova
orekhova.elena.v at gmail.com
Mon Dec 7 06:23:12 EST 2015
Hi,
It could be useful to add information about events timing (i.e. to explain
that the 1st column contains time in samples counting from the moment
before the actual data recording - 'minus raw.first sample time' )
Since the events are mentioned in a few places, I am not sure where to add
this info.
I leave it to you guys.
Best,
Elena
On 7 December 2015 at 12:02, Denis-Alexander Engemann <
denis.engemann at gmail.com> wrote:
> 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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