On estimating the difference limen in duration discrimination tasks: A comparison of the 2AFC and the reminder task

被引:85
作者
Lapid, Einat [1 ]
Ulrich, Rolf [1 ]
Rammsayer, Thomas [2 ]
机构
[1] Univ Tubingen, D-72072 Tubingen, Germany
[2] Univ Bern, Bern, Switzerland
来源
PERCEPTION & PSYCHOPHYSICS | 2008年 / 70卷 / 02期
关键词
D O I
10.3758/PP.70.2.291
中图分类号
B84 [心理学];
学科分类号
04 ; 0402 ;
摘要
This article assesses whether the two-alternative forced-choice (2AFC) and the reminder tasks (i.e., method of constant stimuli) yield identical estimates of the difference limen (DL). In a series of six experiments, participants discriminated between two duration stimuli. Experiments 1-5 employed auditory stimuli, and Experiment 6 employed visual stimuli. Experiments I and 2 combined each of the two tasks with an adaptive and a nonadaptive procedure for threshold estimation. Experiment 3 varied the distribution of the comparison levels, whereas Experiment 4 employed random interstimulus intervals. Experiments 5 and 6 examined the influence of the presentation order of the standard and comparison stimuli. Results indicate that both the adaptive and the nonadaptive procedures yield virtually identical DL estimates; yet, the 2AFC task produces consistently larger DLs than does the reminder task. In addition, DL increases when the standard occurs in the second rather than in the first stimulus position. In order to account for these results, we assume that participants use an internal standard instead of the actually presented standard as a reference for their judgment.
引用
收藏
页码:291 / 305
页数:15
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