Advanced

Assessment and interpretation of bias in 2AFC stimulus comparison through chronometric analysis

Hellström, Åke and Patching, Geoffrey LU (2011) Fechner Day: Proceedings of the 27th Annual Meeting of the International Society for Psychophysics In [Host publication title missing]
Abstract
Random-walk and diffusion models for two-choice comparison of paired successive or simultaneous stimuli focus on response time (RT), modeled as the time needed to reach one or the other barrier, and its relation to the response probabilities. Logit P1 = ln[P1/(1-P1)], where P1 is the probability of responding ”first greater,” can be seen as a measure of subjective stimulus difference, d. Signed response speed (SRS), ±1/RT with the sign of the response, yields another d measure. The two measures are highly correlated and, importantly, the intercept in the regression of logit P1 on mean SRS estimates the asymmetry of the starting point relative to the barriers, that is, the bias. New analyses of data from Patching, Englund, and Hellström... (More)
Random-walk and diffusion models for two-choice comparison of paired successive or simultaneous stimuli focus on response time (RT), modeled as the time needed to reach one or the other barrier, and its relation to the response probabilities. Logit P1 = ln[P1/(1-P1)], where P1 is the probability of responding ”first greater,” can be seen as a measure of subjective stimulus difference, d. Signed response speed (SRS), ±1/RT with the sign of the response, yields another d measure. The two measures are highly correlated and, importantly, the intercept in the regression of logit P1 on mean SRS estimates the asymmetry of the starting point relative to the barriers, that is, the bias. New analyses of data from Patching, Englund, and Hellström (2011) show that this bias helps explain the variability of the time-and space order errors. Possible connections of the bias with the parameters in Hellström’s (2003) sensation-weighting (SW) model are explored. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
[Host publication title missing]
publisher
International Society for Psychophysics
conference name
Fechner Day: Proceedings of the 27th Annual Meeting of the International Society for Psychophysics
language
English
LU publication?
yes
id
f31575a4-1da0-4dd6-8b87-f067febae1b8 (old id 2374887)
date added to LUP
2012-03-29 16:27:39
date last changed
2016-04-16 09:15:12
@inproceedings{f31575a4-1da0-4dd6-8b87-f067febae1b8,
  abstract     = {Random-walk and diffusion models for two-choice comparison of paired successive or simultaneous stimuli focus on response time (RT), modeled as the time needed to reach one or the other barrier, and its relation to the response probabilities. Logit P1 = ln[P1/(1-P1)], where P1 is the probability of responding ”first greater,” can be seen as a measure of subjective stimulus difference, d. Signed response speed (SRS), ±1/RT with the sign of the response, yields another d measure. The two measures are highly correlated and, importantly, the intercept in the regression of logit P1 on mean SRS estimates the asymmetry of the starting point relative to the barriers, that is, the bias. New analyses of data from Patching, Englund, and Hellström (2011) show that this bias helps explain the variability of the time-and space order errors. Possible connections of the bias with the parameters in Hellström’s (2003) sensation-weighting (SW) model are explored.},
  author       = {Hellström, Åke and Patching, Geoffrey},
  booktitle    = {[Host publication title missing]},
  language     = {eng},
  publisher    = {International Society for Psychophysics},
  title        = {Assessment and interpretation of bias in 2AFC stimulus comparison through chronometric analysis},
  year         = {2011},
}