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The following technical report is available online at 
http://cogsci.ucsd.edu  (follow links to Tech Reports & Software )
Physical copies are also available (see the site for information).


              Analysis of Direction Selectivity Arising From 
                 Recurrent Cortical Interactions. 

	            Paul Mineiro and David Zipser

                         UCSD Cogsci TR.97.03

  The relative contributions of feedforward and recurrent connectivity to the
  direction selective responses of cells in layer IVB of primary visual cortex
  is currently the subject of debate in the neuroscience community.  Recently
  biophysically detailed simulations have shown realistic direction selective
  responses can be achieved via recurrent cortical interactions between cells
  with non-direction selective feedforward input
  \cite{Koch:DS,Maex:SpikeMotion}.  Unfortunately the complexity of these
  models, while desirable for detailed comparison with biology, are difficult
  to analyze mathematically.  In this paper a relatively simple cortical
  dynamical model is used to analyze the emergence of direction selective
  responses via recurrent interactions.  Comparison between a model based on
  our analysis and physiological data is presented.  The approach also allows
  analysis of the recurrently propagated signal, revealing the predictive
  nature of the implementation.