title: Brightness discrimination ability in the West Indian manatee (Trichechus manatus).
abstract: Two manatees were tested on their ability to discriminate brightness using a series of 30 shades of grey varying from white to black. The animals were trained to discriminate between different shades of grey in a twofold simultaneous-choice situation. Their ability to discern brightness differences correlates with Werber's law, and the calculated Werber fraction is 0.35.
authors.affiliation: Department of Zoology, University of Vienna, Austria.
authors.forename: U
authors.initials: U
authors.lastname: Griebel
authors.forename: A
authors.initials: A
authors.lastname: Schmid
mesh_terms: D000818:Animals; D003118:Color Perception / Q000502:physiology*; D005260:Female; D008322:Mammals / Q000502:physiology*