How do scientists test a cat's number sense in experiments?

Scientists test a cat's number sense by observing their reactions to changes in quantity during "invisible displacement" tasks. Cats watch objects disappear behind a screen, and their gaze duration indicates if they detect numerical inconsistencies. For example, if two objects go behind a screen but only one reappears, a cat's longer stare at the unexpected outcome suggests they recognized the numerical error. This methodology helps researchers understand a cat's basic ability to distinguish quantities, similar to how human infants are tested. Discover more about the fascinating world of feline cognition in our comprehensive article.