parallel port communication: event markers

[sofia laureano]

Dear Mich,

Thank you very much for your reply.
The Proposal is basically a slide where I have the offer (an amount of
money) and the options whether to accept it (a) or to reject it (b).
I would like to have a mark when the slide appears (i.e. when the
participant gets to know the offer) and then two different marks, one
for accept one for reject.

Being this all in one slide, shall the Inline come before or after the
Proposal slide?

And is this what I should write in the Inline?

Proposal.OnsetSignalData = 255
Proposal.OnsetSignalPort = &H378

If Proposal.RESP = "A" then Proposal.OffsetSignalData = 28 else
Proposal.OffsetSignalData = 29


thank you!

Best,
Sofia


On Jul 2, 1:45 pm, Michiel Spape <Michiel.Sp... at nottingham.ac.uk>
wrote:
> Hi,
> Doesn't seem to have much to do with the fact that you're using the parallel port for communication, I would say. I believe the following inline should be enough to send the number 28 over the parallel port:
> WritePort &H378, 28
>
> But conceivably, you want to have some data sent at the onset of this Proposal thingamabob you have, hence '.OnsetSignalData', rather than using the above which just sends the data, 28, at the moment this line is encountered at runtime.
> So, as far as I know, Proposal.OnsetSignalData = 255 sends '255' over the parallel port, and you can change that to different numbers which you'll just have to reconvert in psychlab to conditions. The rest is just very basic inline. Let's say, you have a screen, TextDisplay1 in which you ask participants to indicate 'Accept' (press A) or 'Reject' (press R). The small inline should do the trick:
> If TextDisplay1.RESP = "A" then Proposal.OffsetSignalData = 28 else Proposal.OffsetSignalData = 29
>
> That's it (as long as this proposal object comes after the inline, and the inline after the TextDisplay1). In PsychLab, you can then say that 28 indicates Accept and 29 reject.
>
> Best,
> Mich
>
> Michiel Spapé
> Research Fellow
> Perception & Action group
> University of Nottingham
> School of Psychology
>
> -----Original Message-----
> From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of sofia laureano
> Sent: 02 July 2009 12:28
> To: E-Prime
> Subject: parallel port communication: event markers
>
> Hi there all,
>
> I have an experiment in e-Prime and I am trying to link it to PsychLab
> equipment. Basically what I need is to programme the task so that it
> sends signals through the parallel port to the psychophysics data
> acquisition unit.
>
> So far, what I've done was to create an Inline object (called
> Proposal) which I've inserted just before Proposal. The inline
> contains the following code:
>
> Proposal.OnsetSignalEnabled = True
> Proposal.OnsetSignalData = 255
> Proposal.OnsetSignalPort = &H378
>
> Then I inserted another Inline just after Proposal, with the following
> code:
>
> Proposal.OffsetSignalEnabled = True
> Proposal.OffsetSignalData = 0
> Proposal.OffsetSignalPort = &H378
>
> It's seems to be working, i.e. events are being marked on the skin
> conductance screen.
> However, I would like it to be differentiating between two events
> (i.e. accept/reject). Participants press a different key for each
> event.
>
> How can I get E-Prime to do this?
>
> Thank you very much.
>
> Best,
> Sofia
>
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