On the formation of an internal standard in discrimination experiments

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1 Department of Psychology On the formation of an internal standard in discrimination experiments The Internal Reference Model 2012/10/04 K. M. Bausenhart, O. Dyjas, & R. Ulrich

2 Why do we need an internal reference to explain discrimination performance? Because we don t always perceive/judge/compare/reproduce just what is present in a given trial! 2 K. M. Bausenhart, O. Dyjas, & R. Ulrich

3 Vierordt effect Reproduction task Over-/ underestimation of short/long durations Bisection task / single stimulus protocol Effects of comparison distribution Sequential effects Time order error ( Type A order effect) and Type B order effect Vierordt (1868) 3 K. M. Bausenhart, O. Dyjas, & R. Ulrich

4 Vierordt effect Single stimulus protocol / Bisection task Can only be accomplished by retaining an internal representation of the standard Effects of comparison distribution Sequential effects Time order error ( Type A order effect) and Type B order effect At the beginning of the experiment s s s s c During the experiment c c c c Longer or shorter than s? 4 K. M. Bausenhart, O. Dyjas, & R. Ulrich

5 Vierordt effect Bisection task / single stimulus protocol Effects of comparison distribution Perceived duration depends on the overall distribution of comparisons Sequential effects Time order error ( Type A order effect) and Type B order effect Brown, McCormack, Smith & Stewart, K. M. Bausenhart, O. Dyjas, & R. Ulrich

6 Vierordt effect Bisection task / single stimulus protocol Effects of comparison distribution Sequential effects Time order error ( Type A order effect) and Type B order effect Gu & Meck, K. M. Bausenhart, O. Dyjas, & R. Ulrich

7 Vierordt effect Bisection task / single stimulus protocol Effects of comparison distribution Sequential effects Time order error ( Type A order effect) and Type B order effect 7 K. M. Bausenhart, O. Dyjas, & R. Ulrich

8 Reminder task Which stimulus lasts longer? s c First! s c t? t s c Second! t 8 K. M. Bausenhart, O. Dyjas, & R. Ulrich

9 The psychometric function 9 K. M. Bausenhart, O. Dyjas, & R. Ulrich

10 Sensitivity indicated by steepness of psychometric function (DL) 2 * DL 10 K. M. Bausenhart, O. Dyjas, & R. Ulrich

11 Time Order Error: Comparison (2nd stimulus) perceived as longer than s (PSE < s) PSE 11 K. M. Bausenhart, O. Dyjas, & R. Ulrich

12 2AFC method Which stimulus lasts longer? s c First! c s t First! t s c? c s t Second! c s? s c Second! t t t 12 K. M. Bausenhart, O. Dyjas, & R. Ulrich

13 2AFC function passes through (0.5,s) No time order error 13 K. M. Bausenhart, O. Dyjas, & R. Ulrich

14 But DL in 2AFC task typically larger than in Reminder task (e.g., Lapid, Ulrich, & Rammsayer, 2008) 14 K. M. Bausenhart, O. Dyjas, & R. Ulrich

15 Possible Sources of DL increase Time order error ( Type A order effect) Typically, to avoid time-order error, response proportions for both stimulus orders, <sc> and <cs>, are averaged But: Averaging leads to overestimation of DL Preferrably: Analyze and report stimulus orders seperately Ulrich & Vorberg, 2009 Ulrich, 2010 Bausenhart, Dyjas, & Vorberg, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

16 Possible Sources of DL increase Time order error ( Type A order effect) Type B order effect Participants are more sensitive in <sc> trials than in <cs> trials 16 K. M. Bausenhart, O. Dyjas, & R. Ulrich

17 Most of these effects can not be explained on basis of simple difference models, like, e.g. Signal Detection Theory Which one is the longer one? t First! D = X X 1 2 D > c R1 D < c R2 17 K. M. Bausenhart, O. Dyjas, & R. Ulrich

18 Then how to explain these effects? In discrimination, we resort to some kind of history e.g., the other stimuli that are present in the experimental context Prominent accounts: - Adaptation level theory / Sensory weighting (Helson, 1964; Hellström, 1979) Current stimulus input is weighted with a reference level Judgment is performed on this compound stimulus magnitude - Memory mixing (e.g., Penney, Allan, Meck, & Gibbon, 1998) E.g., in Bisection task: Different standard durations used withing the same temporal context are combined into a single memory distribution (Gu & Meck, 2010). This single distribution is used as a reference for judgment - Range frequency theory (Brown, McCormack, Smith, & Stewart, 2005) The magnitude of a single stimulus is weighted with the range of all stimuli and its ordinal position in the stimulus range 18 K. M. Bausenhart, O. Dyjas, & R. Ulrich

19 How exactly do you mix memory? Arithmetic / Geometric mean of all the stimuli? Weighted by stimulus range and ordinal position of a stimulus? or By means of a continous updating process: The internal reference model - Geometric moving average Respond R1, else R2 19 K. M. Bausenhart, O. Dyjas, & R. Ulrich

20 Experiment 1 Which one is the longer one? First! t Two successive white noise bursts, s and c s = 500 ms c = ms Order <sc> and <cs> is varied Order varies within blocks or between blocks Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

21 Das Bild kann zurzeit nicht angezeigt werden. IRM The prediction for Sensitivity Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

22 The random order condition Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

23 Results for Sensitivity Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

24 IRM The prediction for Sequential effects on PSE In blocked conditions: c in trial n-1 larger / smaller than s Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

25 Results: Sequential effects Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

26 Experiment 2 Which one is the longer one? First! t Two successive white discs, s and c s = 500 ms c = ms Order <sc> and <cs> is varied Order varies within blocks or between blocks Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

27 Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

28 Results for Sensitivity Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

29 Results: Sequential effects Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

30 Conclusion from Exp. 1 and 2 IRM simulation results closely resemble data pattern IRM can explain Type B effects IRM can explain sequential effects on PSE Dyjas, Bausenhart, & Ulrich, K. M. Bausenhart, O. Dyjas, & R. Ulrich

31 Can IRM account for effects of comparison distribution? Right skewed distribution Left skewed distribution 31 K. M. Bausenhart, O. Dyjas, & R. Ulrich

32 Can IRM account for effects of comparison distribution? 32 K. M. Bausenhart, O. Dyjas, & R. Ulrich

33 IRM single stimulus version n Respond small, else large - Can account for single stimulus sequential effects - Can account for Vierordt effect 33 Author/Topic/Category/Title etc University of Tuebingen

34 And finally: A direct glimpse at the Internal Reference. Two successive sine tones, s and c s = 800 ms c = ms Order <sc> and <cs> is varied between blocks Visual cue after presentation of s and c - 1 reproduce first stimulus - 2 reproduce second stimulus 1 t 34 K. M. Bausenhart, O. Dyjas, & R. Ulrich

35 A direct glimpse at the Internal Reference. Standard at second position remembered longer than at first position (Time order error) 35 K. M. Bausenhart, O. Dyjas, & R. Ulrich Comparison at first position biased towards standard duration, at second position almost veridically

36 A direct glimpse at the Internal Reference. Sequential effects of reproduction, stronger when the first stimulus has to be reproduced! 36 K. M. Bausenhart, O. Dyjas, & R. Ulrich

37 Conclusion from Exp. 3 In cued reproduction, both stimuli seem to enter the Internal reference - Both stimuli have to be remembered until cue Internal reference still has more impact on reproduction of the first stimulus than on the second stimulus Sequential effects rule out simple mean stimulus reproduction explanation 37 K. M. Bausenhart, O. Dyjas, & R. Ulrich

38 Thank you. Thank you for your attention! Contact: Dekanat Musterstraße Tübingen Germany Phone: Fax: K. M. Bausenhart, O. Dyjas, & R. Ulrich

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