Estimating the difference limen in 2AFC tasks: Pitfalls and improved estimators
- Cite this article as:
- Ulrich, R. & Vorberg, D. Attention, Perception, & Psychophysics (2009) 71: 1219. doi:10.3758/APP.71.6.1219
Discrimination performance is often assessed by measuring the difference limen (DL; or just noticeable difference) in a two-alternative forced choice (2AFC) task. Here, we show that the DL estimated from 2AFC percentage-correct data is likely to systematically under- or overestimate true discrimination performance if order effects are present. We show how pitfalls with the 2AFC task may be avoided and suggest a novel approach for analyzing 2AFC data.