Visual discrimination and resolution in freshwater stingrays (Potamotrygon motoro).

Potamotrygon motoro has been shown to use vision to orient in a laboratory setting and has been successfully trained in cognitive behavioral studies using visual stimuli. This study explores P. motoro's visual discrimination abilities in the context of two-alternative forced-choice experiments, with a focus on shape and contrast, stimulus orientation, and visual resolution.

Serial reversal learning in freshwater stingrays (Potamotrygon motoro).

Serial reversal learning is considered a reliable approach for the testing of behavioral flexibility, and animals that inhabit fluctuating habitats and different environments are expected to possess behavioral and cognitive flexibility. The ocellate river stingray (Potamotrygon motoro) is one such species. Comprising the first serial reversal learning experiment among elasmobranchs, this study trained seven juvenile P.