[solved] how to use one interval screen with several durations

Comments

• Edwin

  March 2014 edited March 2014

  Hi,

  Two options:

  Fixed delay amounts

  Add a new variable to your loop, e.g. called "delay". Refer to this variable for the duration of your sketchpad, using square brackets: [delay].

  Random delay

  There is a plug-in built into OpenSesame to do precisely this. It's called the advanced_delay. Your experiment could look as follows:

  # start of your experiment
  - loop (for the trial blocks)
      - sequence (for a single trial)
          - blank sketchpad (duration of 0)
          - advanced delay (see below for details)
          - sketchpad showing a dot (duration of 0)
          - keyboard_response
  

  Now for the advanced delay: it requires two values: the average delay, and the jitter. Furthermore, you have to indicate the type of jitter. In you case, you want values to occur equally between 2.2 and 3 seconds, so set the jitter mode to uniform. The average duration should be 2600 ms, and the jitter should be 400 ms. This gives you values between 2600-400 ms (= 2.2 seconds) and 2600+400 ms (= 3 seconds).

  Good luck!
• pshahim

  March 2014 edited 4:44PM

  Hi Edwin,

  We used your first option. Thank you very much.