title: Brightness discrimination in the harbor seal (Phoca vitulina).
abstract: The brightness discrimination ability of a male harbor seal was investigated at an ambient illumination of 0.9lx. The visual stimuli consisted of circular gray discs that were presented on a black background on a TFT monitor. Eight standard intensities were tested against sets of lower comparison intensities. In accordance with Weber's law we observed a constant gain of the just noticeable intensity difference with increasing intensity of the standard stimulus. The calculated Weber fraction is 0.14. This result indicates that the brightness discrimination ability of the harbor seal is comparable to that of humans.
authors: General Zoology & Neurobiology, University of Bochum, ND 6/33, D-44780 Bochum, Germany.
authors: Christine
authors: C
authors: Scholtyssek
authors: Almut
authors: A
authors: Kelber
authors: Guido
authors: G
authors: Dehnhardt
mesh_terms: D000818:Animals; D015350:Contrast Sensitivity / Q000502:physiology*; D004192:Discrimination, Psychological / Q000502:physiology*; D005556:Form Perception / Q000502:physiology; D008029:Lighting; D008297:Male; D046049:Phoca / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D012684:Sensory Thresholds