Abstract
Axonal growth and pruning are the brain’s primary method of controlling the structured sparsity of its neural circuits. Without long-distance axon branches connecting distal neurons, no direct communication is possible. Artificial neural networks have almost entirely ignored axonal growth and pruning, instead relying on implicit assumptions that prioritize dendritic/synaptic learning above all other concerns. This project proposes a new model called the axon game, which allows biologically-inspired axonal plasticity dynamics to be incorporated into most artificial neural network models in a computationally efficient manner. First, we demonstrate that the axon game replicates multiple previously defined pre-synaptic cortical maps. Second, we demonstrate that the axon game integrated with a synaptic learning model similar to the Laterally Interconnected Synergetically Self-Organizing Map (LISSOM), can simulate the interaction of axonal plasticity and synaptic plasticity within one model creating both pre-synaptic and post-synaptic cortical maps. Finally, it is shown that pre-synaptic and post-synaptic maps can be decoupled from one another. This decoupling depends on the relative sizes of dendritic and axonal arbors, and indicates a novel theoretical prediction about how axonal and synaptic dynamics interact.
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15 June 2021
A Correction to this paper has been published: https://doi.org/10.1007/s11063-021-10526-6
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Appendix 1
Appendix 1
1.1 Simulation Settings for Sect. 6
This section contains the parameter settings for the axon game used in the section titled “Simulated Axonal Maps”. The version of the axon game implemented for this paper uses a simple auto-scale feature whereby some of the input parameters are adjusted to produce results that can be compared to a standard 100 × 100 scale simulation. The \({\alpha }_{APDV}\) is multiplied by a factor of the largest simulation dimension divided by 100 when an axis of the simulation is larger than 100. Additionally, the starting exuberance \(E{X}_{0}\) is also scaled by the same factor.
Symbol | Value |
---|---|
Res | 170 × 250 |
Co-Act | Covariance |
\(Seed\) | True |
\({\sigma }_{seed}\) | 0 |
\({\sigma }_{y}^{diff}\) | 10 |
\({\sigma }_{\eta }^{diff}\) | 1 |
\({\alpha }_{N}\) | 6 |
\({\alpha }_{S}^{0}\) | 0.002 |
\({\alpha }_{S}^{1}\) | 0.04 |
\({\alpha }_{R}\) | 0.08 |
\({\alpha }_{C}\) | 50 |
\({\alpha }_{global}\) | 0.3 |
\({\alpha }_{local}\) | 0.08 |
\({\beta }_{s}\) | 0.1 |
\(B\) | 8 |
\(k\) | 200 |
\({t}_{end}\) | 100 |
\(E{X}_{0}\) | 1.5 |
\(E{X}_{k}\) | 0.025 |
\({P}_{0}^{grow}\) | 1 |
\({P}_{1}^{grow}\) | 1 |
1.2 Simulation settings for Sect. 7
This section contains the simulation parameters used for the second set of demonstrations that combined the Axon game with H-LISSOM Tables 3 and 4
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Ryland, J. Modeling Axonal Plasticity in Artificial Neural Networks. Neural Process Lett 53, 1119–1146 (2021). https://doi.org/10.1007/s11063-021-10433-w
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DOI: https://doi.org/10.1007/s11063-021-10433-w