Basal ganglia-thalamocortical loop model of action selection (Humphries and Gurney 2002)

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Contributor:NIJC Administrator (nijcadmin)  |  Created Date: Mar 16, 2011 15:38:06  |  Visits:1846  |  Runs:57
Free Keywords: intra-thalamic circuit, thalamocortical circuits, action selection, Basal ganglia
ID 79
Title Basal ganglia-thalamocortical loop model of action selection (Humphries and Gurney 2002)
Free Keywords intra-thalamic circuit, thalamocortical circuits, action selection, Basal ganglia
Description Our basal ganglia model is embed into a wider circuit containing the motor thalamocortical loop and thalamic reticular nucleus (TRN). Simulation of this extended model showed that the additions gave five main results which are desirable in a selection/switching mechanism. First, low salience actions (i.e. those with low urgency) could be selected. Second, the range of salience values over which actions could be switched between was increased. Third, the contrast between the selected and non-selected actions was enhanced via improved differentiation of outputs from the BG. Fourth, transient increases in the salience of a non-selected action were prevented from interrupting the ongoing action, unless the transient was of sufficient magnitude. Finally, the selection of the ongoing action persisted when a new closely matched salience action became active. The first result was facilitated by the thalamocortical loop; the rest were dependent on the presence of the TRN.
Last Modified Date Mar 22, 2013 10:34:55
Created Date Mar 16, 2011 15:38:06
Contributor NIJC Administrator (nijcadmin)
Item Type Online Simulation
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Mar 22, 2013 Modified; Contents URL.
Feb 2, 2012 Modified; Description, Free Keywords, Simulator Name.
Mar 24, 2011 Modified; Index.
Mar 23, 2011 Modified; Preview, Simulator.
Model Contents URL http://senselab.med.yale.edu/modeldb/ShowModel.asp?model=83562
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