Similar to the question "How to use a QUEST staircase in 2-AFC”. I also have a question about using QUEST. In fact, I too tried to find an answer in
Psychophysics: A Practical Introduction by Kingdom & Prins; Experimental Design by Cunningham & Wallraven; Visual Psychophysics by Lu & Dosher.
Although I found a script of QUEST, it is just for the detection task, where the threshold is always the upper threshold. I want to study also the lower threshold in the discrimination task. Is anyone can give me some hints?