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lüll Structure of cortical microcircuit theory Foldy C; Dyhrfjeld-Johnsen J; Soltesz IJ Physiol 2005[Jan]; 562 (Pt 1): 47-54Recent experimental and theoretical investigations have made considerable advances in three major areas relating to the structural basis of quantitative cortical microcircuit theory. The first concerns the nature of the cellular units, encompassing the increasingly precise identification and progressively more complete listing of the individual cellular species that constitute the various cortical networks. The second element addresses the problem of heterogeneity, including the demonstration of the importance of cell to cell variability within defined interneuronal populations and the application of the Shannon-Wiener diversity index for the quantitative assessment of the number and relative abundance of interneuronal species. The third component relates to the discovery of basic topological principles underlying the circuit wiring, revealing a surprising order in the architectural design of networks. These new advances deepen our understanding of the computational principles embedded in cortical microcircuits, and they also provide novel opportunities for building realistic models of mammalian cortical microcircuits.|Algorithms[MESH]|Animals[MESH]|Cerebral Cortex/anatomy & histology/chemistry/*physiology[MESH]|Humans[MESH]|Interneurons/chemistry/physiology[MESH]|Nerve Net/anatomy & histology/chemistry/*physiology[MESH]|Species Specificity[MESH] |