Neural Comput - A neural circuit for robust time-to-contact estimation based on primate MST.

Tópicos

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Resumo

Time-to-contact (TTC) estimation is beneficial for visual navigation. It can be estimated from an image projection, either in a camera or on the retina, by looking at the rate of expansion of an object. When expansion rate (E) is properly defined, TTC = 1/E. Primate dorsal MST cells have receptive field structures suited to the estimation of expansion and TTC. However, the role of MST cells in TTC estimation has been discounted because of large receptive fields, the fact that neither they nor preceding brain areas appear to decompose the motion field to estimate divergence, and a lack of experimental data. This letter demonstrates mathematically that template models of dorsal MST cells can be constructed such that the output of the template match provides an accurate and robust estimate of TTC. The template match extracts the relevant components of the motion field and scales them such that the output of each component of the template match is an estimate of expansion. It then combines these component estimates to provide a mean estimate of expansion across the object. The output of model MST provides a direct measure of TTC. The ViSTARS model of primate visual navigation was updated to incorporate the modified templates. In ViSTARS and in primates, speed is represented as a population code in V1 and MT. A population code for speed complicates TTC estimation from a template match. Results presented in this letter demonstrate that the updated template model of MST accurately codes TTC across a population of model MST cells. We conclude that the updated template model of dorsal MST simultaneously and accurately codes TTC and heading regardless of receptive field size, object size, or motion representation. It is possible that a subpopulation of MST cells in primates represents expansion in this way.

Resumo Limpo

timetocontact ttc estim benefici visual navig can estim imag project either camera retina look rate expans object expans rate e proper defin ttc e primat dorsal mst cell recept field structur suit estim expans ttc howev role mst cell ttc estim discount larg recept field fact neither preced brain area appear decompos motion field estim diverg lack experiment data letter demonstr mathemat templat model dorsal mst cell can construct output templat match provid accur robust estim ttc templat match extract relev compon motion field scale output compon templat match estim expans combin compon estim provid mean estim expans across object output model mst provid direct measur ttc vistar model primat visual navig updat incorpor modifi templat vistar primat speed repres popul code v mt popul code speed complic ttc estim templat match result present letter demonstr updat templat model mst accur code ttc across popul model mst cell conclud updat templat model dorsal mst simultan accur code ttc head regardless recept field size object size motion represent possibl subpopul mst cell primat repres expans way

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