Konzeptionelle Modellierung geometrischer Invarianzen in der visuellen Wahrnehmung von Primaten - Situativ gesteuerte Complex-Bildung als Grundlage invarianter Zellantworten
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Philipps-Universität Marburg
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Abstract
Our sense of vision conveys a stable percept of the environment. We
can recognize objects regardless of the viewpoint we take. Available
neural models can only partly explain this invariant perception.
Standard models are based on hierarchic arrangements of nerve cells.
They aim at constructing specific neural responses to complex visual
stimuli from responses to simple stimulus components. A main concept
is the neural realisation of logical OR operations by convergent
projections (complex-formation). However, generation of invariance to
certain stimulus variations is in conflict with the formation of
stimulus specific responses -- both at the signal level, and as a
model of thinking. Consequently, classical models of invariant visual
shape perception show weaknesses, like the binding problem, and the
inability to distinguish objects with overlapping sets of retinal
projections. I present a conceptual modelling approach to the issue.
Living beings actively explore their environment: External physical
conditions do influence processing in the visual system. Here, I
formulate the concept of situation controlled complex-formation, based
on the fact that external parameters exert control on neural transfer
properties. As an application of this concept, I present two models of
invariant visual processing: (1) neural retinal slip correction, and
(2) distance invariant representation of visual objects. My models
overcome substantial problems of classical modelling, at the cost of
increased neural resources. For the model of distance invariance, the
concept of situation controlled complex-formation predicts a new cell
class, the distance complex cells. Recent experiments report the
finding of neurons with similar properties.
In both models, situation controlled complex-formation generates scene
representations, which are independent of the controlling parameter.
Most probably, the same method can produce invariance to other
external conditions, too. Situation controlled complex-formation hence
presents a universal tool for conceptual modelling of neural
invariances. Moreover, it is an effective model of thinking in our
understanding of cortical processing.
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Dates
Created: 2004Issued: 2004-12-14Updated: 2011-08-10
Faculty
Fachbereich Physik
Publisher
Philipps-Universität Marburg
Language
ger
Data types
DoctoralThesis
Keywords
GainfieldNeural engineeringInformation processing in vision and hearingComplex cellGain fieldComplex-Zelle
DFG-subjects
Optisches SignalNeuronales NetzNervennetz / ModellNervennetzAktives SehenVisuelles SystemSehrinNeuronenverschaltungNervenzelle
DDC-Numbers
530
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Kupper, Rüdiger: Konzeptionelle Modellierung geometrischer Invarianzen in der visuellen Wahrnehmung von Primaten - Situativ gesteuerte Complex-Bildung als Grundlage invarianter Zellantworten. : Philipps-Universität Marburg 2004-12-14. DOI: https://doi.org/10.17192/z2004.0639.
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This item has been published with the following license: In Copyright