Summary: Psychol Res (1994) 56:66-77
© Springer-Verlag 1994
A probabilistic multidimensional model of location information
W. Todd Maddoxl, William Prinzmetal2,Richard B. Ivry2, and F. Gregory Ashby3
1Estes Lab, Department of Psychology, Harvard University, Cambridge, MA 02138, U.S.A.
(Now at Department of Psychology, Arizona State University,Tempe, AZ 85287, U.S.A.
2University of California at Berkeley, Cafifornia, U.S.A.
3University of California at Santa Barbara, California,U.S.A.
Received January 6, 1993/Accepted June 15, 1993
Summary. A probabilistic multidimensional model of lo-
cation discrimination is developed and applied to data from
an experiment in which subjects are required to determine
whether a briefly presented horizontal and vertical bar are
touching. The proposed gap-detection model assumes that
errors in perception are due to variability in the perceived
location and/or in the perceived length of the bars. A series
of gap-detection models that allow variability only in per-
ceived location were rejected on the basis of likelihood-