Trigger event markers from Eprime to BIOPAC

[Paul Groot]

Hi Catarina,

The SendPulse inline script of your es-file already contains a few
lines to send a pulse using WritePort. You could replace them with
something like this:

DutWords.OnsetSignalEnabled = True
DutWords.OnsetSignalPort = &H378
DutWords.OnsetSignalData = c.GetAttrib("marker")

DutWords.OffsetSignalEnabled = True
DutWords.OffsetSignalPort = &H378
DutWords.OffsetSignalData = 0  ' reset all digital lines to zero

Since BioPac will acquire the 8 digital TTL lines as separate signals,
you would probably want to use powers of two for the markers:
1,2,4,8,16,32,64 and128. If you don't use powers of two, you will get
a mixture of simultaneous pulses. (You could use a calculation channel
to convert the 8 digital channels back to a numerical one, but I would
suggest you should only do this when you need more than 8 unique
marker codes.)

Also make sure that the marker attribute is defined in all relevant
lists, because I  noticed that the second part of your exp. is missing
the marker attribute.

I also have the feeling that part of your script contains duplicate
(identical) objects. Perhaps you need duplicates in some places to be
able to implement English/Dutch specific elements, but I'm sure that
in some places you could (re)use the same E-Object. (For example
Blank1 and Blank2 are probably identical). Although this is not a big
deal in your script, I often see scripts having large amounts of
copied objects. One of the side-effects of having duplicates is that
the log-file will become unnecessary complex.


Best,
Paul


2012/3/29 Catarina Azevedo <catarina.melo.azevedo at gmail.com>:
> Hi all!
>
> I'm new in eprime and so I realize that this will be a beginner
> question.But I really need some help!
>
> I programmed an experiment in which participants will see first a
> block of English words and then a block of Dutch words (or the
> contrary, order was counterbalanced). The 40 words they will see in
> the first block will be chosen pseudo-randomly from a list of 80
> words. In the second block they will see their translations. I found a
> way to do it with Nested lists (without scripts).
>
> Each participant will see 10 EnglishPositive, 10EnglishNegative, 10
> EnglishNeutral, 10English Taboo and 10 DutchPositive, 10DutchNegative,
> 10 DutchNeutral and 10DutchTaboo words.
>
> I insert a column with the title "marker", being the options 1,2,3,4
> for the english words and 5,6,7 and 8 for the dutch words
> (corresponding to the type of words).
>
> I would like to know the inline I should write and where so that I
> would have 8 different types of events in BIOPAC. I saw this one:
>
> xxx.OnsetSignalEnabled = True
> xxx.OnsetSignalPort = &H378
> xxx.OnsetSignalData = 1
>
> xxx.OffsetSignalEnabled = True
> xxx.OffsetSignalPort = &H378
> xxx.OffsetSignalData = 2
>
> But I if I put like this
>
> marker.OnsetSignalEnabled = True
> marker.OnsetSignalPort = &H378
> marker.OnsetSignalData = 1
>
> marker.OffsetSignalEnabled = True
> marker.OffsetSignalPort = &H378
> marker.OffsetSignalData = 2
>
> I'm not sure if it will specified the type of words (events) in
> Biopac.
>
> Here you have the es. file
> http://dl.dropbox.com/u/31016950/CAmarch2012quaseEXP.es
>
> Thank you for your attention
>
> Catarina
>
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