Paper available: Model of visual cortical responses

[Ken Miller]

A preprint of the following paper is now available from 
ftp://ftp.keck.ucsf.edu/pub/ken/lauritzen_etal.pdf
or from
http://www.keck.ucsf.edu/~ken (click on "Publications", then on
"Models of Neuronal Integration and Circuitry") 


Lauritzen, T.Z., A.E. Krukowski and K.D. Miller (2001).  "Local
correlation-based circuitry can account for responses to multi-grating
stimuli in a model of cat V1."  In press, Journal of Neurophysiology.

Abstract:

In cortical simple cells of cat striate cortex, the response to a
visual stimulus of the preferred orientation is partially suppressed
by simultaneous presentation of a stimulus at the orthogonal
orientation, an effect known as ``cross-orientation inhibition".  It
has been argued that this is due to the presence of inhibitory
connections between cells tuned for different orientations, but
intracellular studies suggest that simple cells receive inhibitory
input primarily from cells with similar orientation tuning.
Furthermore, response suppression can be elicited by a variety of
non-preferred stimuli at all orientations.  Here we study a model
circuit that was presented previously to address many aspects of
simple cell orientation tuning, which is based on local intracortical
connectivity between cells of similar orientation tuning.  We show
that this model circuit can account for many aspects of
cross-orientation inhibition and, more generally, of response
suppression by non-preferred stimuli and of other non-linear
properties of responses to stimulation with multiple gratings.


Ken
 
        Kenneth D. Miller               telephone: (415) 476-8217
	Associate Professor		fax: (415) 476-4929
        Dept. of Physiology, UCSF	internet: ken at phy.ucsf.edu
        513 Parnassus			www: http://www.keck.ucsf.edu/~ken
        San Francisco, CA 94143-0444