Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.
Science Signaling - Call For Papers

Site Tools

  • AAAS
  • Subscribe
  • Feedback

Site Search

Search Advanced

Science 10 July 1987:
Vol. 237. no. 4811, pp. 184 - 187
DOI: 10.1126/science.3603015
Prev | Table of Contents | Next

Articles

Science, Vol 237, Issue 4811, 184-187
Copyright © 1987 by American Association for the Advancement of Science

articles

The inversion of sensory processing by feedback pathways: a model of visual cognitive functions

E Harth, KP Unnikrishnan, and AS Pandya

The mammalian visual system has a hierarchic structure with extensive reciprocal connections. A model is proposed in which the feedback pathways serve to modify afferent sensory stimuli in ways that enhance and complete sensory input patterns, suppress irrelevant features, and generate quasi-sensory patterns when afferent stimulation is weak or absent. Such inversion of sensory coding and feature extraction can be achieved by optimization processes in which scalar responses derived from high-level neural analyzers are used as cost functions to modify the filter properties of more peripheral sensory relays. An optimization algorithm, Alopex, which is used in the model, is readily implemented with known neural circuitry. The functioning of the system is investigated by computer simulations.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
A Novel Model-Based Hearing Compensation Design Using a Gradient-Free Optimization Method.
Z. Chen, S. Becker, J. Bondy, I. C. Bruce, and S. Haykin (2005)
Neural Comput. 17, 2648-2671
   Abstract »    Full Text »    PDF »
The Cocktail Party Problem.
S. Haykin and Z. Chen (2005)
Neural Comput. 17, 1875-1902
   Abstract »    Full Text »    PDF »
Derivation and Analysis of Basic Computational Operations of Thalamocortical Circuits.
A. Rodriguez, J. Whitson, and R. Granger (2004)
J. Cogn. Neurosci. 16, 856-877
   Abstract »    Full Text »    PDF »
Towards a Theory of the Laminar Architecture of Cerebral Cortex: Computational Clues from the Visual System.
R. D. S. Raizada and S. Grossberg (2003)
Cereb Cortex 13, 100-113
   Abstract »    Full Text »    PDF »
Modulatory Effect of Cortical Activation on the Lemniscal Auditory Thalamus of the Guinea Pig.
J. He, Y.-Q. Yu, Y. Xiong, T. Hashikawa, and Y.-S. Chan (2002)
J Neurophysiol 88, 1040-1050
   Abstract »    Full Text »    PDF »
Modulatory Effects of Regional Cortical Activation on the Onset Responses of the Cat Medial Geniculate Neurons.
J. He (1997)
J Neurophysiol 77, 896-908
   Abstract »    Full Text »    PDF »


ADVERTISEMENT
Click Me!

ADVERTISEMENT
Click Me!

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)