Estimating the difference limen in 2AFC tasks: Pitfalls and improved estimators. Attention, perception & psychophysics [Atten Percept Psychophys] Journal article | | Title | Estimating the difference limen in 2AFC tasks: Pitfalls and improved estimators. | | Author(s) | Ulrich R, Vorberg D | | Institution | University of Tübingen, Tübingen, Germany. | | Source | Atten Percept Psychophys 2009 Aug; 71(6):1219-27. | | 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. | | Language | eng | | Pub Type(s) | Journal Article
| | PubMed ID | 19633337 |
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