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<HTML><HEAD><TITLE>Jim Bednar</TITLE></HEAD><BODY><H1>Jim Bednar</H1><!WA0><!WA0><!WA0><!WA0><!WA0><IMG SRC="http://www.cs.utexas.edu/users/jbednar/JimBlurryInFrance.gif" ALIGN=bottom ALT=Picture of me --><p><b> PhD. Candidate, Dept. of Computer Sciences, The University of Texas at Austin. </b><p><ul><li> M.A. in Computer Science, University of Texas at Austin, Austin, Texas, May 1997.<li> B.A. in Philosophy, University of Texas at Austin, Austin, Texas, May 1994.<li> B.S. in Electrical/Computer Engineering, University of Texas at Austin, Austin, Texas, December 1993.</ul><p><!WA1><!WA1><!WA1><!WA1><!WA1><IMG SRC="http://www.cs.utexas.edu/users/jbednar/color-line.gif"><h2>Research</h2> <blockquote> My research concentrates on biologically realistic modeling ofcognitive processes using artificial neural networks. I seek to usethe dramatic advances in computing technology over the past fewdecades to make equally dramatic advances in our understanding of thehuman mind. With the computing power now available and soon to beavailable, realistic simulations of cortical processing are becomingpractical. This enables us to make (and, if necessary, refute)testable hypotheses about brain function. The overall goal is to makecognitive research into an empirical science, rather than the purelyphilosophical domain it has been for centuries.My master's thesis, ``Tilt Aftereffects in a Self-Organizing Model ofthe Primary Visual Cortex'', is nearly complete. The abstract:<blockquote> Visual illusions and aftereffects have long been studied by psychologists and vision researchers because these apparent functional failures might offer insight into how visual processing is carried out by the brain. A particular class of visual illusions called tilt illusions and tilt aftereffects are thought to arise in the primary visual cortex of humans, and thus serve as test cases for theories about that area of the brain. Specifically, several researchers have proposed that they result from lateral inhibition between neurons receiving visual input. <p> The thesis examines tilt illusions and aftereffects in <!WA2><!WA2><!WA2><!WA2><!WA2><a href="http://www.cs.utexas.edu/users/nn/web-pubs/htmlbook96/sirosh/"> RF-LISSOM</a> (Sirosh and Miikkulainen, 1995), a self-organizing model of the primary visual cortex that incorporates such lateral interactions. It is demonstrated that the self-organizing principles driving RF-LISSOM result in aftereffects which are qualitatively and quantitatively similar to those measured in humans. On the basis of these results, a new explanation for so-called ``indirect effects'' (interactions between lines with very different orientations) is proposed in the thesis. The self-organizing model should also apply to other figural aftereffects, such as spatial frequency aftereffects, which we predict result from the same lateral interaction processes.</blockquote>A preliminary report of the research is available as <!WA3><!WA3><!WA3><!WA3><!WA3><ahref="http://www.cs.utexas.edu/users/nn/pages/publications/abstracts.html#miikkulainen.visual-cortex.ps.Z">a PostScript file</a>. I am also beginning my doctoral research,which will include further simulations of detailed low-level visualbehavior, using an extension of the RF-LISSOM model.</blockquote><a name="contact"><h2>Contact Information</h2> </a><dl><dt> <b> Email: </b> <dd> <!WA4><!WA4><!WA4><!WA4><!WA4><A HREF="mailto://jbednar@cs.utexas.edu"><b> jbednar@cs.utexas.edu </b></A> <p><dt> <b> Mailing address: </b><dd> <!WA5><!WA5><!WA5><!WA5><!WA5><A HREF="http://www.utexas.edu"> The University of Texas at Austin </A><dd> <!WA6><!WA6><!WA6><!WA6><!WA6><A HREF="http://www.cs.utexas.edu"> Department of Computer Sciences </A>, <!WA7><!WA7><!WA7><!WA7><!WA7><A HREF="http://www.utexas.edu/maps/main/buildings/tay.html"> TAY </A> 2.124<dd> <!WA8><!WA8><!WA8><!WA8><!WA8><A HREF="http://www.yahoo.com/Regional/U_S__States/Texas/Cities__Counties__and_Regions/Austin/"> Austin </a>, <!WA9><!WA9><!WA9><!WA9><!WA9><A HREF="http://www.yahoo.com/Regional/U_S__States/Texas/"> TX </A> 78712-1188 <p><dt> Information from the <!WA10><!WA10><!WA10><!WA10><!WA10><a href="http://www.cs.utexas.edu/cgi/finger/jbednar"><b> finger </b></a> command<p><dt><!WA11><!WA11><!WA11><!WA11><!WA11><A HREF="http://www.cs.utexas.edu/cgi/rwho/jbednar"><b> Machines </b></A> I am logged into in this department<p><dt>My resume, in <!WA12><!WA12><!WA12><!WA12><!WA12><A HREF="http://www.cs.utexas.edu/users/jbednar/ResumeS96.ps"><b>Postscript</b></A> or <!WA13><!WA13><!WA13><!WA13><!WA13><A HREF="http://www.cs.utexas.edu/users/jbednar/ResumeS96.text"><b>ASCII</b></A> format</dl><!WA14><!WA14><!WA14><!WA14><!WA14><a href="http://www.cs.utexas.edu/users/jbednar/hotlist.html"> <h2>Links to the Web</h2> </a> (Probably outdated.)<!WA15><!WA15><!WA15><!WA15><!WA15><a href="http://www.cs.utexas.edu/users/jbednar/papers.html"> <h2>Old Papers</h2> </a> (Not too interesting.)<p><!WA16><!WA16><!WA16><!WA16><!WA16><IMG SRC="http://www.cs.utexas.edu/users/jbednar/color-line.gif"><p><!-- ====================================================================== --><address>jbednar@cs.utexas.edu</address> <P>Last updated: July 9, 1996</BODY></HTML>⌨️ 快捷键说明
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