title: DLs in reminder and 2AFC tasks: data and models.
abstract: García-Pérez and Alcalá-Quintana (2010) dispute the conclusion of Lapid, Ulrich, and Rammsayer (2008) that the two-alternative forced choice (2AFC) task yields meaningfully larger estimates of the difference limen (DL) than does the reminder task. García-Pérez and Alcalá-Quintana overlook, however, fundamental properties of 2AFC psychometric functions and Type B order errors in their reanalysis. In addition, their favored theory (i.e., the difference model with guessing) does not provide a plausible account for why the 2AFC task tends to yield larger DLs (by about 50%) than does the reminder task. In trying to clarify these issues, I hope to advance the proper assessment of discrimination performance in 2AFC tasks.
authors.affiliation: Abteilung für Allgemeine und Biologische Psychologie, Psychologisches Institut, Universität Tübingen, Tübingen, Germany. ulrich@uni-tuebingen.de
authors.forename: Rolf
authors.initials: R
authors.lastname: Ulrich
mesh_terms: D000465:Algorithms; D002755:Choice Behavior; D004056:Differential Threshold; D004192:Discrimination, Psychological; D006801:Humans; D007600:Judgment; D008568:Memory; D015233:Models, Statistical; D011594:Psychometrics / Q000706:statistics & numerical data; D011601:Psychophysics / Q000379:methods; D012107:Research Design / Q000592:standards; D017603:Signal Detection, Psychological; D013647:Task Performance and Analysis