Exact start time

Fri Jul 25 11:46:25 UTC 2014

If you don't  need accuracy under 100 ms, you could use the TCP/IP
communication protocol, which is also supported by EPrime when using inline
script. However, that would not be good enough for most EEG/ERP
experiments, so in that case you could use the other (LSL) protocol. The
downside of that is that LSL is not supported by eprime, and the only way
to implement it would be to use an external DLL or COM object that is
programmed in a programming language like C++. (Which requires serious
programming skills.) So, when that is not an option, you should probably
buy the TTL input recorder because it is not very difficult to generate the
TTL trigger on computers that have a parallel printer port. (Double check
this on the PC you are going to use for EPrime.) By using the trigger
input, you will loose the option to send unique markers for specific events
or types of stimuli. Perhaps it would be possible to combine the TTL input
recorder and TCP/IP to get the best of both worlds: sufficient accuracy and
coded markers.

Paul

On 25 July 2014 11:48, MIsabel Cardeñosa <misabelcarde at gmail.com> wrote:

> Hi Paul,
>
> Thanks a lot for your answer!
>
> I'm using this EEG recorder ( http://www.neuroelectrics.com/enobio ). It
> has a TCP/IP port opened for send triggers and it seems to be the easiest
> way of communication.
> Here ( http://wiki.neuroelectrics.com/index.php/Interacting_with_NIC ) is
> explained how to interact with NIC using other software, and the choices
> they give are TCP/IP and LSL.
> Also, I saw they have an External TTL Input Recorder (
> http://www.neuroelectrics.com/sites/neuroelectrics.com/files/enobio/NE_TTL_Trigger_Receiver_UserManual.pdf
> ) but I don't have it . If there is not solution I guess I would have to
> buy it.
>
> Hope anyone can help me. Thanks!!
>
> El viernes, 25 de julio de 2014 09:35:44 UTC+2, Paul Groot escribió:
>>
>> Hi MIsabel,
>>
>> Unfortunately you cannot synchronize a stimulus computer and an EEG
>> recorder accurately this way. Most EEG systems have a special feature to
>> synchronize with external systems. Traditionally this is done by using a so
>> called TTL signal, which can be generated using a parallel printer port for
>> example. Such a signal can be generated by EPRime with millisecond
>> accuracy. But there exists other synchronization methods as well, so it
>> depends on the EEG recorder what type of synchronization is supported.
>> Perhaps I could be more specific if you mention the type of EEG device
>> you're using...
>>
>> Best,
>> Paul
>>
>>
>> On 24 July 2014 13:44, MIsabel Cardeñosa <misabe... at gmail.com> wrote:
>>
>>> Hi all,
>>>
>>> I'm working on an integration of E-Prime 2 Standard edition with an EEG
>>> signal recorder, and I found a problem with time measurement:
>>>
>>> With E-Prime I can see the start time once the experiment is finished in
>>> the E-Data for example, but it comes with the format "dd/mm/yyyy HH:MM:SS".
>>> The problem is that I need to know milliseconds of start time too or the
>>> experiment won't worth it at all.
>>>
>>> I looked at Now() and Time$, and both return a Date object with the
>>> previous format.
>>>
>>> Trying to find a solution I though that maybe if I use
>>>       myDate = DateAdd("s",3,Now())
>>> and after it
>>>       While Now()  < myDate
>>>       Wend
>>> I could force the start 3 seconds later, but after test it I realized
>>> milliseconds are taken too although it doesn't show them.
>>>
>>> Does anyone now how to create a Date with only HH:MM:SS.00000000... or a
>>> better solution?
>>>
>>>
>>> Thanks in advance!
>>>
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