Evidence that blue-on cells are part of the third geniculocortical pathway in primates

Paul R. Martin*, Andrew J R White, Ann K. Goodchild, Heath D. Wilder, Ann E. Sefton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

225 Citations (Scopus)


Colour vision in primates is mediated by cone opponent ganglion cells in the retina, whose axons project to the dorsal lateral geniculate nucleus in the visual thalamus. It has long been assumed that cone opponent ganglion cells project to the parvocellular layers of the geniculate. Here, we examine the role of a third subdivision of the geniculocortical pathway: the interlaminar or koniocellular geniculate relay cells. We made extracellular recordings in the dorsal lateral geniculate nucleus of the common marmoset Callithrix jacchus, a New World monkey in which the interlaminar cells are well segregated from the parvocellular layers. We found that one group of colour opponent cells, the blue-on cells, was largely segregated to the interlaminar zone. This segregation was common to dichromatic ('red-green colour-blind') and trichromatic marmosets. The result calls into question the traditional notion that all colour information passes through the parvocellular division of the retino-geniculo-cortical pathway in primates.

Original languageEnglish
Pages (from-to)1536-1541
Number of pages6
JournalEuropean Journal of Neuroscience
Issue number7
Publication statusPublished - 1997
Externally publishedYes


  • Callithrix jacchus
  • Colour vision
  • Koniocellular
  • Magnocellular
  • Parvocellular


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