Exact start time

[Paul Groot]

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 <misabelcarde 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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