Estimating the difference limen in 2AFC tasks: pitfalls and improved estimators.

  title={Estimating the difference limen in 2AFC tasks: pitfalls and improved estimators.},
  author={Rolf Ulrich and Dirk Vorberg},
  journal={Attention, perception & psychophysics},
  volume={71 6},
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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