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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN"><!Converted with LaTeX2HTML 95.1 (Fri Jan 20 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds ><HEAD><TITLE>Self-Organization of Orientation Maps, Lateral Connections, andDynamic Receptive Fields in the Primary Visual Cortex</TITLE></HEAD><BODY><meta name="description" value="Self-Organization of Orientation Maps, Lateral Connections, andDynamic Receptive Fields in the Primary Visual Cortex"><meta name="keywords" value="s"><meta name="resource-type" value="document"><meta name="distribution" value="global"><P> <HR><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><!WA0><A NAME=tex2html79 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node1.html"><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><!WA1><IMG ALIGN=BOTTOM ALT="next" SRC="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/images/next_motif.gif"></A> <!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><!WA2><A NAME=tex2html77 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/"><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><!WA3><IMG ALIGN=BOTTOM ALT="up" SRC="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/images/up_motif.gif"></A> <!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><!WA4><IMG ALIGN=BOTTOM ALT="previous" SRC="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/images/previous_motif_gr.gif"> <BR><B> Next:</B> <!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><!WA5><A NAME=tex2html80 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node1.html"> Introduction</A><B>Up:</B> <!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><!WA6><A NAME=tex2html78 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/">Lateral Interactions in the Cortex: Structure and Function</A><BR> <HR> <P> <H1>Self-Organization of Orientation Maps, Lateral Connections, andDynamic Receptive Fields in the Primary Visual Cortex</H1><P><STRONG><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><!WA7><A NAME=tex2html9 HREF="http://www.cs.utexas.edu/users/sirosh">Joseph Sirosh<!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><!WA8><A NAME=tex2html5 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/footnode.html#279"><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><!WA9><IMG ALIGN=BOTTOM ALT="gif" SRC="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/images/foot_motif.gif"></A> </A>,<!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><!WA10><A NAME=tex2html10 HREF="http://www.cs.utexas.edu/users/risto">Risto Miikkulainen</A>, and<!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><!WA11><A NAME=tex2html11 HREF="http://www.cs.utexas.edu/users/jbednar">James A. Bednar</A><BR> <!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><!WA12><A NAME=tex2html12 HREF="http://www.cs.utexas.edu">Department of Computer Sciences</A><BR> <!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><!WA13><A NAME=tex2html13 HREF="http://www.utexas.edu">The University of Texas at Austin</A><BR> Austin, TX 78712<BR> <i><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><!WA14><A NAME=tex2html6 HREF="mailto:sirosh@cs.utexas.edu">sirosh</A>,<!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><!WA15><A NAME=tex2html7 HREF="mailto:risto@cs.utexas.edu">risto</A>,<!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><!WA16><A NAME=tex2html8 HREF="mailto:jbednar@cs.utexas.edu">jbednar@cs.utexas.edu</A></i></STRONG><P><P><STRONG></STRONG><P><P><H3>Abstract</H3><EM> Through massively parallel computational simulations, we studied howa large network of simple neural elements (the RF-LISSOM model) coulddevelop a functional organization similar to that of the primary visualcortex. It was found that starting from a 'tabula rasa' state, theafferent and lateral connections in the network self-organizedcooperatively and simultaneously through a common Hebbian mechanism, andproduced receptive fields (RFs), orientation maps, and patterns oflateral connections that follow the receptive field organization. Second,we hypothesized that similar self-organizing mechanisms continueoperating in the adult cortex, maintaining it in a continuously-adaptingdynamic equilibrium with the input, and tested this hypothesis on theself-organized model. When the equilibrium was perturbed by a retinalscotoma, RFs expanded in size in a reversible fashion, matching recentneurobiological observations in the cat and psychophysical experimentsin the human. Third, a possible functional role for the lateralconnections in the cortex was verified in the model. The lateralconnections learned correlations in the network activity, and inprocessing retinal input, filtered out redundancies and established asparse coding of the input. The conclusion is that the lateralconnections in the cortex could act as as a negative filter that allowsthe cortex to efficiently process the massive amounts of visualinformation presented by the environment.</EM><P><UL> <LI> <!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><!WA17><A NAME=tex2html81 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node1.html#SECTION00010000000000000000"> Introduction</A><LI> <!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><!WA18><A NAME=tex2html82 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node2.html#SECTION00020000000000000000"> The Receptive Field LISSOM (RF-LISSOM) model</A><LI> <!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><!WA19><A NAME=tex2html83 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node3.html#SECTION00030000000000000000"> Self-Organization</A><LI> <!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><!WA20><A NAME=tex2html84 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node4.html#SECTION00040000000000000000"> Dynamic Receptive Fields</A><LI> <!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><!WA21><A NAME=tex2html85 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node5.html#SECTION00050000000000000000"> Functional Role of the Self-Organized Structures</A><LI> <!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><!WA22><A NAME=tex2html86 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node6.html#SECTION00060000000000000000"> Conclusion</A><LI> <!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><!WA23><A NAME=tex2html87 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node7.html#SECTION00070000000000000000"> Acknowledgements</A><LI> <!WA24><!WA24><!WA24><!WA24><!WA24><!WA24><!WA24><A NAME=tex2html88 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node8.html">References</A></UL><HR><!WA25><!WA25><!WA25><!WA25><!WA25><!WA25><!WA25><A NAME=tex2html79 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node1.html"><!WA26><!WA26><!WA26><!WA26><!WA26><!WA26><!WA26><IMG ALIGN=BOTTOM ALT="next" SRC="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/images/next_motif.gif"></A> <!WA27><!WA27><!WA27><!WA27><!WA27><!WA27><!WA27><A NAME=tex2html77 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/"><!WA28><!WA28><!WA28><!WA28><!WA28><!WA28><!WA28><IMG ALIGN=BOTTOM ALT="up" SRC="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/images/up_motif.gif"></A> <!WA29><!WA29><!WA29><!WA29><!WA29><!WA29><!WA29><IMG ALIGN=BOTTOM ALT="previous" SRC="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/images/previous_motif_gr.gif"> <BR><B> Next:</B> <!WA30><!WA30><!WA30><!WA30><!WA30><!WA30><!WA30><A NAME=tex2html80 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node1.html"> Introduction</A><B>Up:</B> <!WA31><!WA31><!WA31><!WA31><!WA31><!WA31><!WA31><A NAME=tex2html78 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/">Lateral Interactions in the Cortex: Structure and Function</A><BR> <HR> <P><!WA32><!WA32><!WA32><!WA32><!WA32><!WA32><!WA32><A NAME=tex2html89 HREF="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/node9.html#SECTION00090000000000000000"> About this document ... </A></BODY>⌨️ 快捷键说明
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