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Cognitive Brain Research 14 (2002) 1019 www.elsevier.com/locate/bres
 

Summary: Cognitive Brain Research 14 (2002) 1019
www.elsevier.com/locate/bres
Research report
Multimodality in the superior colliculus: an information theoretic
analysis
a a a,b ,
*Paul Patton , Kamel Belkacem-Boussaid , Thomas J. Anastasio
a
Beckman Institute, University of Illinois at Urbana/Champaign, Urbana, IL, USA
b
Department of Molecular and Integrative Physiology, University of Illinois at Urbana/Champaign, Urbana, IL, USA
Accepted 2 May 2001
Abstract
The deep superior colliculus (DSC) integrates multisensory input and triggers an orienting movement toward the source of stimulation
(target). It would seem reasonable to suppose that input of an additional modality should always increase the amount of information
received by a DSC neuron concerning a target. However, of all DSC neurons studied, only about one half in the cat and one-quarter in the
monkey were multimodal. The rest received only unimodal input. Multimodal DSC neurons show the properties of multisensory
enhancement, in which the neural response to an input of one modality is augmented by input of another modality, and of inverse
effectiveness, in which weaker unimodal responses produce a higher percentage enhancement. Previously, we demonstrated that these
properties are consistent with the hypothesis that DSC neurons use Bayes' rule to compute the posterior probability that a target is present

  

Source: Anastasio, Thomas J. - Beckman Institute for Advanced Science and Technology & Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign

 

Collections: Biology and Medicine