In the round

2019-03-07 07:10:14

PEOPLE are better at spotting imperfect circles than dodgy squares. Johannes Zanker at the Australian National University in Canberra asked five people to distinguish perfect circles from minutely stretched ellipsoids, and squares from “near-square” rectangles (Naturwissenschaften, vol 86, p 492). The observers were more sensitive to the deviations in the circles than the distorted squares. People’s brains judge spatial relationships best when they see whole curved shapes, Zanker believes. “By investigating such problems, we get clues about the strategies and tricks which the brain is using to help us survive in a demanding visual environment,