The Paced Auditory Serial Addition Task — Computerized (PASAT-c) is a laboratory measure of distress tolerance used in behavioral research. Participants add each number to the one before it and click the sum, with difficulty increasing across three levels by shortening the inter-stimulus interval.
Originally developed by Carl W. Lejuez and colleagues, the PASAT-c's primary outcome — Level 3 persistence — measures how long a participant continues under escalating cognitive demand before choosing to quit. This platform provides researchers with a free, open-access, standardized web implementation.