Comprehension questions after response following specific stimuli

[atfrederiksen]

I'm working on a forced choice experiment, where participants are presented with a sentence including a pronoun and then choose which of two names they think the pronoun referred to. That all works with my current code. However, I also want to follow some of the trials with a comprehension question (also a forced choice response) after participants have made their response. The problem I'm having is that the comprehension questions have to occur after specific items. I tried to use catch-trials, but that doesn't seem like the right approach, given that each comprehension questions can only follow one specific trial.  
I also tried to set up as a separate trial template containing the trials to be followed by comprehension questions plus the comprehension questions themselves. By keeping the stimulus_pattern in a fixed order, I can make sure the appropriate comprehension question follows its intended stimulus + response. But then I could not figure our how to create a block consisting of N regular trials followed by exactly two of these separate trials, i.e.  1) a stimulus followed by its forced choice response, followed by 2) a comprehension question asking about something in the preceding stimulus sentence, followed by a forced choice response).
Does anyone know a way to do this?

[Lucy - FF Researcher Support]

Hello! Have you looked at trial yoking? This tutorial goes over the implementation: https://news.findingfive.com/2019/07/17/...ed-trials/

Please let us know if that doesn't work for your design.

[atfrederiksen]

Hello! Have you looked at trial yoking? This tutorial goes over the implementation: https://news.findingfive.com/2019/07/17/...ed-trials/

Please let us know if that doesn't work for your design.


Thanks! Yoked trials should work well for pairing comprehension questions to specific stimuli. What I still cannot figure out is how to mix in such yoked trials with non-yoked trials, that is, stimuli that are not followed by comprehension questions. For my study, only 25% of trials are followed by a comprehension question. 

[Ting]

There are potentially two ways to approach this 25% requirement:

If there's no strict need for randomization of stimuli, then perhaps the easiest way is to use the catch trial feature (https://help.findingfive.com/api/procedu...tch_trials). The downsize is that it will introduce a pattern: a comprehension question pops up every X stimuli.

Alternatively, a hacky way to do it is to tweak the trial template that generates your comprehension question trials so that 75% of them actually a blank trial (or a sentence saying "this screen is intentionally left blank" or something like that). Then when you yoked everything together, it'll seem like only 25% of them have a comprehension question.

[atfrederiksen]

There are potentially two ways to approach this 25% requirement:

If there's no strict need for randomization of stimuli, then perhaps the easiest way is to use the catch trial feature (https://help.findingfive.com/api/procedu...tch_trials). The downsize is that it will introduce a pattern: a comprehension question pops up every X stimuli.

Alternatively, a hacky way to do it is to tweak the trial template that generates your comprehension question trials so that 75% of them actually a blank trial (or a sentence saying "this screen is intentionally left blank" or something like that). Then when you yoked everything together, it'll seem like only 25% of them have a comprehension question.

Thanks! The first option won't work in this case, because of the predictability of the questions. The second option seems to works - I created blank text stimuli and paired them with background_audio responses set to duration: 0.01. And if anyone has a more elegant solution than what I did here, I'd love to hear it! Thanks again.