A Neuronal Network Model of the Primate Visual System: Color Mechanisms in the Retina, LGN and V1 Martínez-Cañada, Pablo Morillas Gutiérrez, Christian Agustín Pelayo Valle, Francisco José Primate Visual System Computational Model Color Coding This work was supported by MINECO-FEDER TIN2016-81041-R grant and the research project P11-TIC-7983 of Junta of Andalucia (Spain), cofinanced by the European Regional Development Fund (ERDF). P. Martínez-Cañada was supported by the PhD scholarship FPU13/01487, awarded by the Government of Spain, FPU program. Color plays a key role in human vision but the neural machinery that underlies the transformation from stimulus to perception is not well understood. Here, we implemented a two-dimensional network model of the first stages in the primate parvocellular pathway (retina, lateral geniculate nucleus and layer 4Cβ in V1) consisting of conductance-based point neurons. Model parameters were tuned based on physiological and anatomical data from the primate foveal and parafoveal vision, the most relevant visual field areas for color vision. We exhaustively benchmarked the model against well-established chromatic and achromatic visual stimuli, showing spatial and temporal responses of the model to disk- and ring-shaped light flashes, spatially uniform squares and sine-wave gratings of varying spatial frequency. The spatiotemporal patterns of parvocellular cells and cortical cells are consistent with their classification into chromatically single-opponent and double-opponent groups, and nonopponent cells selective for luminance stimuli. The model was implemented in the widely used neural simulation tool NEST and released as open source software. The aim of our modeling is to provide a biologically realistic framework within which a broad range of neuronal interactions can be examined at several different levels, with a focus on understanding how color information is processed. 2026-02-10T11:19:49Z 2026-02-10T11:19:49Z 2018 journal article Published version: Martínez-Cañada, Pablo et al. A Neuronal Network Model of the Primate Visual System: Color Mechanisms in the Retina, LGN and V1. International Journal of Neural SystemsVol. 29, No. 02, 1850036 (2019). https://doi.org/10.1142/S0129065718500363 https://hdl.handle.net/10481/110816 10.1142/S0129065718500363 eng open access World Scientific Publishing