Abstract
Since Santiago Ramon y Cajal, neuroscientists have been fascinated by the shapes of dendritic arbors for more than 100 years. However, the principle underlying these complex and diverse structures remains elusive. Here we propose that evolution has tinkered with brain design to maximize its functionality while minimizing the cost associated with building and maintaining it. We hypothesize that the functionality of a neuron benefits from a larger repertoire of connectivity patterns between dendrites and surrounding axons, and the cost of a dendritic arbor increases with its total length and path length from synapses to soma. We solved this optimization problem by drawing an analogy with maximization of the entropy for a given energy in statistical physics. The solution predicts several scaling relationships between arbor dimensions and closely fits with experimental data. Moreover, our theory may explain why basal dendrites of pyramidal cells and Purkinje cells, the two major cell types in the mammalian brains, exhibit distinct morphologies.
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Wen, Q. (2014). A Statistical Theory of Dendritic Morphology. In: Cuntz, H., Remme, M., Torben-Nielsen, B. (eds) The Computing Dendrite. Springer Series in Computational Neuroscience, vol 11. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8094-5_7
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