I am trying to build a picture comparison task (PCT) with psychopy.
In the PCT paradigm, participants perform an ongoing task consisting of a series of trials in which they see a pair of images appear on the computer screen. In each trial, participants are asked to indicate whether the pairs of images are identical or different by pressing the corresponding key on a standard computer keyboard (“L” = identical; “D” = different). They are also asked to perform an additional task which consists of remembering to press a specific key on the keyboard (“Y”) when a picture of an animal appears on the screen. My block consists of 90 ongoing task trials and 6 additional task trials. The ongoing task trials are randomised.
My problem: I would like to randomize the 6 additional task trials but have them always appear at the same position, i.e. every 15 trials.
Any help with this would be hugely appreciated.