Weber fractions and time-order errors for long and short durations: Implications for modeling

Hellström, Åke; Rammsayer, Thomas (October 2013). Weber fractions and time-order errors for long and short durations: Implications for modeling. In: Fechner Day 2013. Proceedings of the 29th Annual Meeting of the International Society for Psychophysics (p. 28). International Society for Psychophysics

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Using a weighted up-down procedure, in each of eight conditions 28 participants compared durations of auditory (noise bursts) or visual (LED flashes) intervals; filled or unfilled with 3-ms markers; with or without feedback. Standards (Sts) were 100 and 1000 ms, and the ISI 900 ms. Intermixedly, presentation orders were St-Comparison (Co) and Co-St. TOEs were positive for St=100-ms and negative for St=1000 ms. Weber fractions (WFs, JND/St) were lowered by feedback. For visual-filled and visual-empty, WFs were highest for St=100 ms. For auditory-filled and visual-empty, St interacted with Order: lowest WFs occurred for St-Co with St=1000 ms, but for Co-St with St=100 ms. Lowest average WFs occurred with St-Co for visual-filled, but with Co-St for visual-empty. The results refute the generalization of better discrimination with St-Co than with Co-St (”type-B effect”), and support the notion of sensation weighting: flexibly differential impact weights of the compared durations in generating the response.

Item Type:

Conference or Workshop Item (Paper)


07 Faculty of Human Sciences > Institute of Psychology > Personality Psychology, Differential Psychology and Diagnostics

UniBE Contributor:

Rammsayer, Thomas


100 Philosophy > 150 Psychology


International Society for Psychophysics




Karin Dubler

Date Deposited:

19 Jun 2014 13:53

Last Modified:

09 Dec 2014 00:12




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