Fig. 2.

Using variables and conditional (“if”) statements. a Independent variables can be defined in a loop item. b By entering [SOA] in the duration field of a sketchpad item, the variable SOA is used to control the presentation duration of the sketchpad. This assumes that SOA has been defined elsewhere in the experiment. c By using [avg_rt] and [acc] as part of the text in a feedback item, appropriate feedback can be given to the user. The variables avg_rt and acc are set automatically by the various response items (e.g., keyboard_response). d Conditional statements can be used to control which items from a sequence will be called. By entering [correct] = 1 in the “Run if…” field of “green_fixation,” the item will be called only if the variable correct has been set to 1. The variable correct is set automatically by the various response items