Neurocontrol III: Differencing models of the basal ganglia - thalamocortical loops
A. Lõrincz
Neural Network World
7,
43--72
(1997)
Abstract
Two models of basal ganglia-thalamocortical loops are proposed,
both of which
feature population coding and utilize local approximations.
The first model is a temporal differencing scheme similar to
the temporal differencing striosome models
. In this model the basal ganglia perform
temporal differencing by means of their two arms, viz.
the direct and the indirect
pathways.
The second model involves
control architeture based on the so called
position-and-direction-to-action (PDA) map
. The architecture utilizes
this PDA map for both static and dynamic state (SDS)
feedback to achieve precise control under perturbed conditions.
Here it is argued that the differencing part of the SDS
scheme may be viewed as a model of the basal ganglia, while the full SDS
scheme may be considered as a model of
basal ganglia - thalamocortical loops. The SDS scheme is different
from the temporal differencing model as it
may also generate correcting commands
if control is taken over and carried out
by independent motor programme executing units. Relationships to
neurobiological and psychophysical findings are discussed.
