NDLI: Psychometric functions for detection and discrimination with and without flankers

Content Provider	Springer Nature Link
Author	García Pérez, Miguel A. Alcalá Quintana, Rocío Woods, Russell L. Peli, Eli
Copyright Year	2011
Abstract	Recent studies have reported that flanking stimuli broaden the psychometric function and lower detection thresholds. In the present study, we measured psychometric functions for detection and discrimination with and without flankers to investigate whether these effects occur throughout the contrast continuum. Our results confirm that lower detection thresholds with flankers are accompanied by broader psychometric functions. Psychometric functions for discrimination reveal that discrimination thresholds with and without flankers are similar across standard levels, and that the broadening of psychometric functions with flankers disappears as standard contrast increases, to the point that psychometric functions at high standard levels are virtually identical with or without flankers. Threshold-versus-contrast (TvC) curves with flankers only differ from TvC curves without flankers in occasional shallower dippers and lower branches on the left of the dipper, but they run virtually superimposed at high standard levels. We discuss differences between our results and other results in the literature, and how they are likely attributed to the differential vulnerability of alternative psychophysical procedures to the effects of presentation order. We show that different models of flanker facilitation can fit the data equally well, which stresses that succeeding at fitting a model does not validate it in any sense.
Starting Page	829
Ending Page	853
Page Count	25
File Format	PDF
ISSN	19433921
Journal	Perception & Psychophysics
Volume Number	73
Issue Number	3
e-ISSN	1943393X
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-01-13
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Detection threshold Discrimination threshold TvC curve Psychometric function Lateral interactions Facilitation Order effects 2AFC Cognitive Psychology
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Sensory Systems Linguistics and Language

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