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Thread: visual and sound stimuli (case 9308)

  1. #1
    Join Date
    Apr 2008
    Posts
    15

    visual and sound stimuli (case 9308)

    I am trying to present visual stimuli that depends upon a participant action (e.g. when they click a button, something appears), while simultaneously presenting sound stimuli that is at fixed intervals (regardless of how quickly the participant responds to the visual stimuli). I can get these to work on their own, but not together within the program.

  2. #2
    Join Date
    Feb 2013
    Posts
    1,092
    Hi ARLUser.

    Would you mind sending me a copy of the input file that you are using? It would be helpful for me to see what you have already tried.

    Thanks.

    Jason
    Jason Reed
    Empirisoft Software Support Specialist

  3. #3
    Join Date
    Jul 2013
    Posts
    28

    Input files

    Hi Jason,

    This was posted by one of our technology staff members, in an effort to help me with my programming issue.

    I've uploaded a few trials to briefly explain one of the problems I'm having. In an effort to make the sound files play at predetermined ITIs, I used the styles.drt document to specify a time window for each stimulus.

    Pps are to press the #1 key, wait for the tone, and then press the #2 key if they hear a target tone. I would like the time window after the tone to be long enough for participants to respond (i.e. a few seconds), however, if I make the styles time frame longer, it messes up the next trial for participants who respond quickly.

    You'll see that if you press button 2 quickly after hearing a tone, and then quickly press button 1 for the next trial, the next tone never sounds. (In fact, it will sound upon releasing button 1.)

    I can't seem to find a way to display tones at predetermined ITIs while simultaneously recording RTs, or non-responses as correct, in DirectRT.
    Attached Files Attached Files

  4. #4
    Join Date
    Feb 2013
    Posts
    1,092
    Thanks for the files that you sent. I ran them on my computer and got the tone to sound on each of the three trials. It also looks like the data recorded everything properly. Take a look at the attached input file and data files and let me know if you have any questions.

    Jason
    Attached Files Attached Files
    Jason Reed
    Empirisoft Software Support Specialist

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