Play sound from a list based on key response until participant chooses to move on

Comments

• Fab

  December 2024

  Hi @JKellogg,

  There are probably several ways to do this., but here's one method that is realtively economical.

  Here's the logic:

  1. Set Up the Experiment

  • Add all your sound files (e.g., 1.ogg, 2.ogg) to the File Pool.
  • Use Inline Script items to manage dynamic behavior.

  2. Task Workflow

  Step 2.1: Initialize Variables

  • Before starting the task, create two shuffled lists of sound file names (one for each key, e.g., 1 and 2).
  • Set up a mechanism to track which sounds have been played and reset the list once all sounds are used.

  Step 2.2: Main Loop

  • Create a Loop item to repeat the task until a specific key (e.g., 0) is pressed.

  Step 2.3: Participant Instructions

  • Use a Sketchpad to display instruction

  Step 2.5: Select a Sound

  Add an

  • Inline Script

  to:

  • Determine which key was pressed.
  • Pick the next sound from the corresponding list.
  • Remove the played sound from the list.
  • Reset and reshuffle the list if it is empty.

  Step 2.6: Play the Sound

  • Dynamically play the selected sound using Python (instead of the sampler; I found this to work best because the sample appears to be set in the prepare phase and in my tests I didn't present the sound selected from the code executed immediately before but only did so on the next trial).

  
  

  A couple of additional comments:

  • I set "run if" of the loop to only execute the code playing the sound if end_experiment is false (this is the variable used to break the loop if the participant presses 0).
  • I used 1.ogg. 2.ogg, 3.ogg as my list 1, and 4.ogg, 5.ogg, 6.ogg as my list 2 (replace with whatever sounds you're using).
  • the loop as only one row but 100 cycles and a break if condition

  Here's my version. You should be able to adapt it to meet your needs:

  play sounds.osexp

  Hope this helps,

  Fabrice.

  
• JKellogg

  December 2024

  I was able to get this to work perfectly, thank you!