Journal of Comparative Physiology A

, Volume 171, Issue 3, pp 351–358 | Cite as

Cone photopigments in nocturnal and diurnal procyonids

  • Gerald H. Jacobs
  • Jess F. DeeganII


Procyonids are small, New World carnivores distributed among some 6 genera. Electroretinogram (ERG) flicker photometry was used to measure the spectra of the cone photopigments for members of two nocturnal species, the raccoon (Procyon lotor) and the kinkajou (Potos flavus), and a diurnal species, the coati (Nasua nasua). Each of the 3 has a class of cone photopigment with maximum sensitivity in the middle to long wavelengths. The spectral positioning of this cone is different for the three. Whereas the raccoon and kinkajou are monochromatic, the diurnal coati is a dichromat having an additional class of cone photopigment with peak sensitivity close to 433 nm.

Key words

Cone photopigments Electroretinogram flicker photometry Procyonids Dichromacy Monochromacy 





short wavelength sensitive


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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Gerald H. Jacobs
    • 1
  • Jess F. DeeganII
    • 1
  1. 1.Department of PsychologyUniversity of CaliforniaSanta BarbaraUSA

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