Additionally, several studies have suggested further subdivisions of the vLGN in other species.He cites "Wild,.M.
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"The koniocellular pathway in primate vision".Physiological and behavioral studies have shown spectral-sensitive and motion-sensitive responses that vary with species.Earlier studies had referred to the IGL as the internal dorsal division of the vLGN.

The inner two layers, (1 and 2) are magnocellular layers, while the outer four layers, (3,4,5 and 6 are parvocellular layers."Overview of the visual system of Tarsius"."Color-related signals in the primate superior colliculus".