Dissn Research Summary - Primary Visual Cortex
WEEVEY
Weevey at cris.com
Mon Nov 27 21:47:34 EST 1995
The following is the abstract from my dissertation which was completed
back in May. More information about this research may be found at the
following URL: http://www.cris.com/~Weevey.
Sincerely,
Eva S. Simmons
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CIRCUITRY STUDIES OF A COMPUTATIONAL MODEL OF THE PRIMARY VISUAL CORTEX
Eva Sabrina Simmons, Ph.D.
University of Texas at Austin, 1995
Supervisor: Robert E. Wyatt
The goals of this project include: (1) proving a procedure for circuit
determination of any cytoarchietectonic area of the brain, given certain
kinds of data are known as in the computational model being used here, and
(2) one circuit of activity will be proposed with three variations on it by
changing the connection strength from the standard. Applying the concept of
the connection matrix and obtaining basic statistical data about the connec-
tions present with respect to presynaptic cells, basic connection data are
obtained as the specified anatomy of the cells and random placement in appro-
priate layers has allowed. Also, by allowing activity over a period of 20 ms,
time propagation data are produced. By keeping a record of activated and
deactivated cells at each time step whose minor types have been read-in from
a file and by figuring out exactly how each cell was activated, pieces of the
circuits can be produced. Later a circuit diagram can be produced from this
data. The sets used for this study are: 400 and 2000 cell sets for basic
data, and 1000 and 2000 cell sets for variations of connection strength. The
following conclusions can be made: (1) The data shows increase in cell type
activity with an increase in cell count in the first two time intervals
(0.00-5.00 ms). (2) The pattern seen over the time intervals is: The first
time interval A (0.00-2.50 ms), is always a period of immense activity.
During the second time interval, B (2.55-5.00 ms), the activity continues to
be heavy, with no new cell types being activated. The following time inter-
vals, C through H (5.05-20.00 ms), moderate activity occurs. (3) The pattern
of activity, as found in experiment, is also found here. (4) A pattern of
cell type activity is seen when comparing sets to some degree, with some
changes depending on cell count and variations in connection strength.
(5) The circuits that have been found were as expected in the literature.
@}---------- THE SIMMONS FACTOR --------- EVA SABRINA SIMMONS, PH.D. -------{@
WWW Personal Page: http://www.cris.com/~Weevey/index.html
@}---- @}---- @}---- WATCH IT, OR IT MIGHT ATTACK!! ;) ---{@ ---{@ ---{@ ---{@
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