I need to insert some catch trials into my experiment and I’m not sure how to do it. I’ve inserted some screenshot of my builder to help explain my experiment and what is required.
The second of these screenshots is the part that I’m focusing on that actually needs the catch trials.
The ‘cue’ routine is just a video that is specified by the excel sheet that I’ve uploaded to the outer ‘trials’ loop. The cue will either be a ‘no cue’ video where participants only see a bright screen and hear wind or one of four actual ‘cues’ that correspond to the experimental condition - participants see green and orange birds in a tree of different percentages (e.g. 90% green and 10% orange, or 70% orange and 30% green).
The trial routine is what is shown in the bigger screenshot - participants here a sequence of sounds that correspond to green and orange birds and have to update their position on a response scale (coded using the two image components) to indicate the proportion of birds in the tree.
I need to have a catch trial after either every cued condition (i.e., not after the ‘no cue’ video or after only half of the cued conditions.****
The cued videos are specified as follows in the conditions excel spreadsheet:
The no cue is specified as follows:
In the catch trials the participants are asked to indicate the proportion of birds in the most recent video that they saw, to ensure they were paying attention to the cues (this will be done using the response scale and they just press the return key to indicate they’ve made their estimate). Following this, the next trial should begin