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Thread: Get a continuous or multiple responses during a set time... (case 17458)

  1. #1
    Join Date
    Dec 2014
    Posts
    2

    Get a continuous or multiple responses during a set time... (case 17458)

    I want to play a 10 minute sound clip in either ML or DRT and have participants respond throughout with button presses. The participants could be responding any number of times so I need something that will basically just log EVERYTHING they do during the 10 minutes that the sound is playing
    Last edited by jason_reed; 12-05-2014 at 12:18 PM.

  2. #2
    Join Date
    Feb 2013
    Posts
    1,090
    If you want to use MediLab for this kind of task and are able to use either the arrow keys or a joystick for participant responses, you could use the On-Line Ratings item type. Take a look at this section of the MediaLab manual for information about it: http://www.empirisoft.com/medialab/h...emtype.htm#olr.


    If you want to use DirectRT, you might be able to do this by taking advantage of the having multiple RTs in a single trial of the .csv input file; see this section of the DirectRT manual: http://www.empirisoft.com/directrt/h...ltiple_rts.htm. Essentially, you could list the sound file as the first stim in the trial. Use of the sound file would most likely require that you put the length of the sound clip in ms in the time cell right next to the stim cell with the name of the sound clip file; see the Sound Clip section here: http://www.empirisoft.com/directrt/h...ectrt_stim.htm. You would then follow it with a series of enough rt:any to record whatever number of keypresses the participants should make during the trial. For a ten minute clip, I could see you needing to use a few dozen just to ensure that your participants won't make more keypresses than the trial has defined. Finally, you can use the Automatic Continuation feature of the MinMax cell of the styles file to create a style code that will automatically advance to the next trial once 10 minutes or so of time has passed to move on to the next trial in the .csv input file; see the MinMax section of the manual here: http://www.empirisoft.com/directrt/h..._rt_limits.htm.


    Good luck!
    Jason Reed
    Empirisoft Software Support Specialist

  3. #3
    Join Date
    Mar 2008
    Posts
    10

    Multiple variable responses to a single stimulus

    It seems a common need is to have participants register one or more keypresses in response to a single stimulus (e.g., a 10-minute audio). The answer below is close to a solution, but I'm having two problems with it that are keeping me from getting it to work optimally:

    First, the time option doesn't set the time for the trial, it sets the delay until the next stimulus is displayed.

    Second, the automatic continuation feature works based on non-responses rather than time spent on the whole trial.

    Meta commands seem much better suited, but currently don't allow us to interrupt trials that I can see. This is unfortunate because DirectRT does have the functionality to to interrupt trials by using conditional logic (i.e., jumping to negative trial numbers). See section on "Jumping" in the manual.

    How could we get this functionality?

    Thanks,
    Jason P.


    Ps. Putting the length of the audio file in the time field (e.g., 60,000ms) delays the next stimulus from appearing. Here I think zero would be better because then we could simultaneously prompt the participants to hit the space bars when they hear a tone or word we want to them identify or have an intrusive thought.


    QUOTE=jason_reed;21232]If you want to use MediLab for this kind of task and are able to use either the arrow keys or a joystick for participant responses, you could use the On-Line Ratings item type. Take a look at this section of the MediaLab manual for information about it: http://www.empirisoft.com/medialab/h...emtype.htm#olr.


    If you want to use DirectRT, you might be able to do this by taking advantage of the having multiple RTs in a single trial of the .csv input file; see this section of the DirectRT manual: http://www.empirisoft.com/directrt/h...ltiple_rts.htm. Essentially, you could list the sound file as the first stim in the trial. Use of the sound file would most likely require that you put the length of the sound clip in ms in the time cell right next to the stim cell with the name of the sound clip file; see the Sound Clip section here: http://www.empirisoft.com/directrt/h...ectrt_stim.htm. You would then follow it with a series of enough rt:any to record whatever number of keypresses the participants should make during the trial. For a ten minute clip, I could see you needing to use a few dozen just to ensure that your participants won't make more keypresses than the trial has defined. Finally, you can use the Automatic Continuation feature of the MinMax cell of the styles file to create a style code that will automatically advance to the next trial once 10 minutes or so of time has passed to move on to the next trial in the .csv input file; see the MinMax section of the manual here: http://www.empirisoft.com/directrt/h..._rt_limits.htm.


    Good luck![/QUOTE]
    Last edited by jasonp220; 07-06-2015 at 11:46 PM. Reason: Better information

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