I am setting up an experiment with a breakdown of
Instructions-presented until participant input
Trial 1 attached to events “blank screen” and “fixation cross”
Trial 2 attached to events “blank screen,” “fixation cross,” and a stimulus list.
The first problem I have is randomizing the stimulus list (a series of 60 faces) without randomizing the fixation cross/blank screen occuring in between each face presenation. Sometimes it seems I’ve fiddled it to the point of success but a consistant problem is a flicker of the fixation cross on it’s first presentation.
The second problem I am having is programming a random assignment of a color patch onto the photo but NOT on the face. Is there a way to specify parameters for random presentation? The faces should randomize once per participant but the location of the color patches can randomize more often. If not, it is possible for me to manually “randomize” the color patch presentation and upload it as .bmp into superlab. In that case, how do I present to each participant a face 1 + color patch without having that same face present itself again with a different color patch assigment?
Do they all have to be seperate events? Seperate trials?
Thankyou so much for your time.