Tree shrew (Tupaia belangeri)

Containing taxa: Animalia » Chordata » Osteichthyes » Sarcopterygii » Tetrapoda » Mammalia » Eutheria » Euarchontoglires » Scandentia

Photoreceptors:
Receptor Opsin λmax Filter λmax Filter λ50% Recep. λmax
Yellow cone556nm  556nm
Rod500nm  501nm
Blue cone444nm  462nm


Opponent processes:
Description (+) Terminus (-) Terminus Mode
Luminance (photopic)
Yellow cone   Photopic
Luminance (scotopic)
Rod   Scotopic
Lime-Blue
567nm - 511nm - 458nm
 
Yellow cone Blue cone
(Rod)
Photopic
Cones-Rods
593nm - 540nm - 483nm
 
Yellow cone Rod Mesopic

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Notes and References:

Jacobs G.H., Neitz J. (1986) Spectral mechanisms and color vision in the tree shrew (Tupaia belangeri). Vision Research 26(20 1986 pp. 291-298

Ghim MM, Hodos W (2006) Spatial contrast sensitivity of birds. J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 192(5):523-34. doi:10.1007/s00359-005-0090-5

Kirk, E. C., & Kay, R. F. (2004). The evolution of high visual acuity in the Anthropoidea. In Anthropoid Origins (pp. 539-602). Springer US.

Warrant E.J., Nilsson D.-E. (1998) Absorption of White Light in Photoreceptors. Vision Res., Vol. 38, No. 2, pp. 195-207. PII: S0042-6989(97)00151-X

Stavenga D., Smits R.P., Hoenders B.J. (1993) Simple Exponential Functions Describing the Absorbance Bands of Visual Pigment Spectra. Vision Res. 33(8) pp. 1011-1017. doi:10.1016/0042-6989(93)90237-Q



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