web-site correction

[M.Usher@ukc.ac.uk]

There was an error in the web-site address I posted yesterday for
our article, to appear in SPATIAL VISION
(Special Issue on "Long Range Spatial Interactions in Vision"),

The correct address is:

http://www.ukc.ac.uk/psychology/people/usherm/public.html

I appologize for the error

-Marius Usher
 
Department of Psychology
University of Kent
 
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     MECHANISMS FOR SPATIAL INTEGRATION IN VISUAL DETECTION:
        A model based on lateral interactions
 
    Marius Usher, Yoram Bonneh, Dov Sagi & Michael Herrmann
 
                   Abstract
 
Studies of visual detection of multiple targets  show a weak
improvement of thresholds with the number of targets, which
corresponds to a fourth-root power law. We find this result to
be inconsistent with probability summation models, and account
for it by a model of ``physiological'' integration that is based
on excitatory lateral interactions in the visual cortex.
The model explains several phenomena which are confirmed by the
experimental data, such as the absence of spatial and temporal
uncertainty effects, temporal summation curves, and facilitation
by a pedestal in 2AFC tasks. The summation exponents are dependent
on the strength of the lateral interactions, and on the distance
and orientation relationship between the elements.