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What happened to 'Duration' in the parallel port trigger plugin?

edited April 2016 in OpenSesame

Hi all!

I just updated the lab computers to run OpenSesame 3 and I found that when using the parallel_port_trigger plugin, the field 'duration' is no longer there! I'd started a discussion more than a year ago about what this field meant (http://forum.cogsci.nl/index.php?p=/discussion/1419/what-is-the-duration-in-the-parallel-port-trigger#Item_9) and from that I got that setting the Sketchpad to 0 and setting the Duration to be however long I wanted to present the stimulus, was a good way to ensure that the trigger was sent exactly when the stimulus was presented.. How do I do that now?

Also, what is the default duration that a trigger is sent for now? I am asking because if I send a trigger and then play a sound file, I would like to know how many milliseconds gap should I expect between when the trigger is sent and when the audio is played!

Thank you so much!

Grusha.

Comments

  • edited 2:57PM

    Hi Grusha,

    This is really a question for @Bob, the developer of this plugin. But looking at the code, it seems that the option is indeed gone. What this option did before (if I recall correctly) is send a 0 trigger after a certain period. You can still do this manually, by simply inserting another parallel_port item to send a 0 trigger. But it's usually not necessary, which, I imagine, is why Bob removed the option.

    Is that helpful?

    Cheers!
    Sebastiaan

  • edited April 2016

    Hi Sebastiaan!

    Thank you for your response!

    The way I understood it, it did send a zero trigger. However, because of the way it worked, that feature could be sort of hacked to make sure that the trigger was being sent exactly at the moment the visual stimulus was being presented. The way it was suggested (and the way I've been doing it) it to present:

    Sketchpad item for 0 ms (with stimuli)

    Parallel port trigger item (duration = duration I want the stimulus)

    Sketchpad item (blank screen)

    Since the parallel_port item doesn't change the screen configuration, the participant sees the stimulus for as long as the duration of the parallel port tigger is, and then the blank screen would sort of re-configure the monitor.

    Is this doing what I think it is doing? Or is there a way to use something else that already exists to do what I want it to do?

    Also, from what I understood, this hack can't be used for auditory stimuli. But, with the duration field, I could specify that I wanted the trigger to be sent for 4 ms. And then after that, the audio file would be played. So I knew that there is a 4ms delay between the trigger being sent and the participant hearing it. Is there a good way of knowing this, now that the duration field is not there?

    Thank you!!

    Grusha.

  • edited 2:57PM

    Hi Grusha,

    Bob answered in this discussion why the duration parameters is missing.

    Good luck.

    Eduard

    Buy Me A Coffee

  • edited April 2016

    Hi Eduard!

    Thank you for pointing me to that! I've asked Bob there about how long the trigger is sent for now and whether the trigger necessarily coincides with the stimulus onset! :)

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