How to present a sound randomly in between trials?

Builder
1

Hello,
I am trying to build an emotional dot motion task in builder. I have created a simple loop and a condition file in which my stimuli are presented and the participants answer each trial with left or right keys and it works fine. But i also have a sound file (a siren sound) and i want it to be played only four times randomly in between trials. Is there any way to do this?
Any help would be appreciated.

2

Please could you describe the trial sequence should it be:

trial (left/right judgement) > 4 sirens with set intervals (presented on 50% of trials for example) >trial left/right) > 4 sirens with set intervals (presented on 50% of trials for example) and so on?

Thanks,
Becca

3

You could set up a routine that plays the sound after every trial. Then use a code component to skip that routine except on your key values of trials.thisN.

For example, you could set up

Begin Experiment

sirenTrial = randint(4)+3

Begin Routine (siren routine)

if trials.thisN == sirenTrial:
     sirenTrial += randint(4)+3
else:
     continueRoutine = False
4

Hello,
thank you for replying…what i wanted to do was to present the subjects with 60 trials of dots and i also had a siren sound that played only four times and each time for 5 second randomly after the dots. for example:

dots (20 trials) > siren (1st time) > siren (2nd time) > dots (15 trials) > dots (10 trials) > siren (3rd time) > dots (15 trials) > siren (4th time)

5

Hello,
What i did 4 days ago was to create 12 inner loops (8 dot loops and 4 siren loops) and a randomizer outer loop:

dot loops (dots_1 = 6 trials, dots_2 = 10 trials, dots_3 = 4 trials, dots_4 = 6 trials ,dots_5 = 8 trials, dots_6 = 6 trials, dots_7 = 6 trials, dots_8 = 14 trials) = 60 trials

siren loops ( siren_1 to siren_4 = 1 trial each) = 4 trials

randomizer outer loop = present a random combination of inner loops for each participant.

then i randomized my inner loops using the method described in the link below:
https://discourse.psychopy.org/t/randomizing-blocks/23590

and it’s now working i expect.

Screenshot 2023-12-14 153145
Screenshot 2023-12-14 1531451220×196 4.48 KB

6

I also tried this code and it plays the sound routine every 4 to 7 trials randomly which is more than the 4 time limit for the sound routine, but what i wanted to do was to present the sound routine only 4 times during the whole loop.

7

My proposal involves a single loop. I assumed you wanted the positions to be random but if you want them after trials 20, 35, 45 and 60 then try this.

Begin Experiment

sirenTrials = [19,34,44,59]

Begin Routine

if trials.thisN not in sirenTrials:
     continueRoutine = False