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. 2018 Oct 31;25(4):359–379. doi: 10.1177/1073858418807887

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© The Author(s) 2018

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — (A) The original Box-and-Arrow model, reformatted. (B) An updated model includes the thalamostriatal, subthalamopallidal (STN → GPe), pallidostriatal and pallidocortical pathways (Saunders and others 2015) as well as striatal interneurons and collaterals. d/iSPNs, direct/indirect pathway spiny projection neurons; GPe/i, external/internal segments of the globus pallidus; SNc/r, substantia nigra pars compacta/reticulata; SC, superior colliculus; INs, striatal interneurons; D₁R/D₂R, dopamine D₁/D₂ receptors; FC, frontal cortex; ACh, acetylcholine.