TR available

[David Plaut]

******************* PLEASE DO NOT FORWARD TO OTHER BBOARDS *******************


		   Perseverative and Semantic Influences on
		 Visual Object Naming Errors in Optic Aphasia:
			    A Connectionist Account

          David C. Plaut                  Tim Shallice
          Department of Psychology        Department of Psychology
	  Carnegie Mellon University      University College, London
          plaut+ at cmu.edu                  ucjtsts at ucl.ac.uk

			 Technical Report PDP.CNS.92.1
   
   A recurrent back-propagation network is trained to generate semantic
   representations of objects from high-level visual representations.  In
   addition to the standard weights, the network has correlational weights
   useful for implementing short-term associative memory.  Under damage, the
   network exhibits the complex semantic and perseverative effects of patients
   with a visual naming disorder known as ``optic aphasia,'' in which
   previously presented objects influence the response to the current object.
   Like optic aphasics, the network produces predominantly semantic rather
   than visual errors because, in contrast to reading, there is some structure
   in the mapping from visual to semantic representations for objects.

This is the third TR in the "Parallel Distributed Processing and Cognitive
Neuroscience" Technical Report series.  To retrieve it via FTP (note that this
is NOT the neuroprose archive):
   
   unix> ftp 128.2.248.152                 # hydra.psy.cmu.edu
   Name: anonymous
   Password: <email address>
   ftp> cd pub/pdp.cns
   ftp> binary
   ftp> get pdp.cns.92.1.ps.Z
   ftp> quit
   unix> zcat pdp.cns.92.1.ps.Z | lpr 

The file ABSTRACTS in the same directory contains the titles and abstracts of
all of the TRs in the series.  For those who do not have FTP access, physical
copies can be requested from Barbara Dorney <bd1q+ at andrew.cmu.edu>.

-Dave
------------------------------------------------------------------------------
David Plaut						        plaut+ at cmu.edu
Department of Psychology					  412/268-5145
Carnegie Mellon University
Pittsburgh, PA  15213-3890