In this study, the contrast sensitivity function (CSF) of one harbor seal was determined behaviorally in a go-/no-go-experiment at an ambient light of 0.9 lx in air. Contrast sensitivity was assessed as the reciprocal value of the threshold contrast for spatial frequencies varying between 0.03 and 1.5 cycles/deg, which were displayed with contrast ranging from 0.02 to 1 on a TFT monitor with a mean luminance of 3.8 cd/m². The CSF of the harbor seal shows the general characteristics described for other species with a peak at an intermediate frequency, a low frequency roll-off and a high frequency cut-off towards the harbor seal's resolution limit determined in a previous study. The position of the CSF's peak lies at approximately 0.5 cycles/deg and adopts an absolute height of 40. These results compare well with the cat's CSF assessed at a comparable adaptation light which might reflect similarities in lifestyle and optics.
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