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Thread: RT for Sounds without termination

  1. #1
    Join Date
    Jan 2007
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    RT for Sounds without termination

    Is it possible to collect an RT response to a sound without the response terminating the sound? I want to present a sound file that's about 6 s long and have the listener respond about halfway through. But, I don't want the response to terminate the sound.....Thanks.

  2. #2
    Join Date
    Nov 2005
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    3,328
    Yes, you can set the time value for the sound file to 6000ms. You'll get the RT and the sound file will play for the full duration.

  3. #3
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    Jan 2007
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    Thanks. I think I'm almost there. However, could you specify the syntax for the time column? I've tried "6000" "6000, RT:any", "RT:any:6000", "RT:any,6000" and many other variants. I continue to get either a full length sound and no RT measure, or an RT measure where the response terminates the sound.

  4. #4
    Join Date
    Nov 2005
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    Yes, you're right, those won't work, but this should--try setting the min-max value for the trial as "0-6000" in your style file. Then, for your time, try "rt:any,full"

    The full keyword tells DirectRT to maintain the current stimulus for the max value even if the response occurs earlier. If you use "0-6000!" then it will also end the trial at 6000ms if they have not yet responded.

  5. #5
    Join Date
    Jan 2007
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    Aahh...and this brings me back to where I started. I have the min-max set to 0-6000 in Style 1, and style 1 selected in the input file. Nonetheless, the stimulus still terminates when the response is made. By the way, I also tried this with pictures and text to see if it was something peculiar to sounds. Both pics and tect stimuli also terminate with a response. Sounds like something simple I'm missing.

  6. #6
    Join Date
    Jan 2007
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    Oops! I got it now. I was editing the "Default Styles" file and using a different one....Thanks!

  7. #7
    Join Date
    Nov 2005
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    3,328
    Ah, yup, that'll get ya. For the home viewers--be sure to remember that DirectRT will always check first to see if there is a style (.drt) file in the same folder as your input file. Only if there is not one there will it read the style settings from the main (default) style file in the C:\DirectRT folder.

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