Principle of Univariance

The principle of univariance states that one and the same visual receptor cell can be excited by different combinations of wavelength and intensity, so that the brain can not know the color of a certain point of the retinal image. One individual photoreceptor type can therefore not differentiate between a change in wavelength and a change in intensity. Thus the wave length information can be extracted only by comparing the responses across different types of receptors. The principle of univariance was first described by W.A.H. Rushton.[1]

References

  1. ↑ Anon (1982). "Obituary William Albert Hugh Rushton F.R.S". Vision Research. 22 (6): 611–621. PMID 7051532.
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