Abstract
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.
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This work was supported by the Deutsche Forschungsgemeinschaft (Grant Ul 116/8-3).
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Ulrich, R., Vorberg, D. Estimating the difference limen in 2AFC tasks: Pitfalls and improved estimators. Attention, Perception, & Psychophysics 71, 1219–1227 (2009). https://doi.org/10.3758/APP.71.6.1219
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DOI: https://doi.org/10.3758/APP.71.6.1219