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2005, Progress in Brain ResearchCitation Excerpt :Many tree- and ground squirrels are diurnal, have good blue–green color vision, and have cone-dominated retinas, similar to the primate fovea. Squirrels have relatively good acuity and high contrast sensitivity (Jacobs et al., 1982) that is slightly superior to tree shrews (Petry et al., 1984), and possess a highly elaborated visual system, including large eyes with good optics (McCourt and Jacobs, 1984), a large and well-laminated lateral geniculate nucleus and V1 with robust visual responses (Hall et al., 1972; Kaas et al., 1972; Van Hooser et al., 2003; Heimel et al., 2005), and a large superior colliculus and pulvinar. In the early mammalian visual system, ganglion cells in the retina project to relay cells in the LGN, which in turn project to the V1.
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