In the Symbol Decision app, participants judge whether combinations of mathematical symbols are “readable”, that is done they follow the conventions of mathematical text.  The task begins with 3 word-based practice trials to ensure the participant understands what is meant by “readable”.  There are two versions of the task; the standard version (Headley, 2016) and the children version which is designed for children in grades 2 through 4. In each version, the participant first observes a focal point (*) at the center of the screen (500ms) followed by the mathematical symbol stimulus (1500ms adult version; 3000ms child version).  Participants are instructed to quickly press the green check mark if the stimulus is “readable” or press the red X if the stimulus is “non-readable”.

Experimental stimuli can be configured. Please download this sample trial list folder and follow the README file to configure the stimuli.

Headley, M. G. (2016). What is symbolic mathematics language literacy? A multilevel mixed methods study of adolescents in a middle school (Order No. 10308492). Available from ProQuest Dissertations & Theses A&I. (1865328066). Retrieved from

Click HERE to download the app