Abstract
The basal ganglia nuclei form a complex network of nuclei often assumed to perform selection, yet their individual roles and how they influence each other is still largely unclear. In particular, the ties between the external and internal parts of the globus pallidus are paradoxical, as anatomical data suggest a potent inhibitory projection between them while electrophysiological recordings indicate that they have similar activities. Here we introduce a theoretical study that reconciles both views on the intra-pallidal projection, by providing a plausible characterization of the relationship between the external and internal globus pallidus. Specifically, we developed a mean-field model of the whole basal ganglia, whose parameterization is optimized to respect best a collection of numerous anatomical and electrophysiological data. We first obtained models respecting all our constraints, hence anatomical and electrophysiological data on the intrapallidal projection are globally consistent. This model furthermore predicts that both aforementioned views about the intra-pallidal projection may be reconciled when this projection is weakly inhibitory, thus making it possible to support similar neural activity in both nuclei and for the entire basal ganglia to select between actions. Second, we predicts that afferent projections are substantially unbalanced towards the external segment, as it receives the strongest excitation from STN and the weakest inhibition from the striatum. Finally, our study strongly suggests that the intrapallidal connection pattern is not focused but diffuse, as this latter pattern is more efficient for the overall selection performed in the basal ganglia.
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Acknowledgments
We warmly thank Dr. Martin Parent for interesting discussion on the single-axon tracing studies, and Dr. Ignasi Cos for helpful comments and suggestions on this work.
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This research was funded by the ANR, project EvoNeuro ANR-09-EMER-005-01.
Appendix
Appendix
1.1 A.1 Mean firing rates at rest
The mean firing rates at rest estimations were derived from the figures in Table 8, under the simplifying assumption that each of the monkey recordings \(\mu \pm \sigma (n)\) constitute an independent sample of a normally distributed random variable. Using an arbitrary big number b, for each set of data we draw \(b*n\) random sample from the \(\mathcal {N(\mu ,\sqrt {\sigma })}\) distribution, and fit the sum of all the simulated data to a normal distribution using least squares.
1.2 A.2 Isoforces of other connections
As supplementary materials, we provide in Fig. 11 the found isoforces of the MSN and STN projections toward GPe and GPi/SNr, and of the GPe outgoing projections (without the GPe \(\rightarrow \) GPi/SNr projection which is already shown in Fig. 6).
1.3 A.3 Illustration of one solution and source code
In order to illustrate further the results of our optimization, in Table 9 are summarized the specific values of the parameters of one solution chosen at random in the pool of optimal solutions. High variations are exhibited in the values of the parameters throughout the set of solutions (as per Tables 6 and 7). The exhaustive parameter values of the solutions presented in this paper is available online along with the source code, in order to permit further studies, on the EvoNeuro project websiteFootnote 1 and on modeldb with the accession number 150206.Footnote 2
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Liénard, J., Girard, B. A biologically constrained model of the whole basal ganglia addressing the paradoxes of connections and selection. J Comput Neurosci 36, 445–468 (2014). https://doi.org/10.1007/s10827-013-0476-2
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DOI: https://doi.org/10.1007/s10827-013-0476-2