Document (#23833)

Author

Stevens, C.F.

Title

¬An evolutionary scaling law for the primate visuaö system and its basis in cortical function.

Source

Nature. 2001, Nr.411 vom 10.5.2001, S.193-195

Year

2001

Abstract

Charles Stevens, of the Salk Institute in La Jolla, California, takes a still different approach, arguing that the number of cells can tell you more than the volumes of different regions. "Our brain is no different from a mouse's," he says, "but we have a lot more of it." Stevens has counted the cells in two regions of the cortex: the lateral geniculate nucleus (LGN), one of the first destinations for nerve signals from the retina, and the primary visual cortex, the next port of call for LGN messages. He found that, in a range of primate species, the number of cells in the primary visual cortex is proportional to the number of cells in the LGN raised to the power of 1.5. So a human uses four times as many neurons to process the input from each LGN neuron as a tarsier, a small Asian primate. Stevens suggests that bigger animals with bigger eyes need proportionally more cortical cells to process the information they receive without sacrificing resolution.

Footnote

Vgl. auch: http://www.nature.com/nsu/010510/010510-10.html

Field

Kognitionswissenschaft

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