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Neural Network Models and the Visual Cortex: The Missing Link between Orientation Selectivity and the Natural Environment

Zetzsche, Christoph and Barth, Erhardt and Krieger, Gerhard and Wegmann, Bernhard (1997) Neural Network Models and the Visual Cortex: The Missing Link between Orientation Selectivity and the Natural Environment. Neuroscience Letters, 228, pp. 155-158.

Full text not available from this repository.

Official URL: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9218631&dopt=Abstract

Abstract

Orientation selectivity is a basic property of neurones in the visual cortex of higher vertebrates. Such neurones can be seen to act as 'feature detectors', which provide an efficient cortical representation of the outside world. More recently, the removal of correlations between the signals of cortical neurones has been suggested as suitable theoretical concept for explaining the development of receptive fields. Corresponding neural network simulations yielded oriented 'receptive field' structures resembling those observed by neurophysiologists. The findings suggest that the 'decorrelation approach' can provide a causal relationship between characteristics of the physical world and brain function. However, we were able to reveal a basic deficit of the decorrelation approach which we illustrate by the construction of two artificial 'worlds', a 'Gaussian' one and an 'orientation-only' one. We show that, according to the decorrelation approach, oriented environmental features would be neither necessary nor sufficient for the development of oriented receptive fields. Thus the link between environmental structure and cortical orientation selectivity still awaits a theoretical explanation.

Document Type:Article
Title:Neural Network Models and the Visual Cortex: The Missing Link between Orientation Selectivity and the Natural Environment
Authors:
AuthorsInstitution or Email of Authors
Zetzsche, ChristophArbeitsgruppe Kognitive Neuroinformatik, Universität Bremen, Germany
Barth, ErhardtInstitut für Neuro- und Bioinformatik, Universität zu Lübeck, Germany
Krieger, GerhardUNSPECIFIED
Wegmann, BernhardSiemens AG
Date:1997
Journal or Publication Title:Neuroscience Letters
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:228
Page Range:pp. 155-158
Status:Published
Keywords:orientation selectivity, higher-order statistics, white noise, neural networks
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignement
DLR - Program:no assignment
DLR - Research theme (Project):other
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Deposited By: Dr.-Ing. Gerhard Krieger
Deposited On:10 Jan 2006
Last Modified:27 Apr 2009 04:48

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