Answer quickly: are there more fish on the left or right side of this image?

You'll notice right away that choosing the correct side without counting the fish individually is pretty tough. This difficulty stems from the fact that humans can only assess relative quantities by snap judgment under certain conditions. Take away six fish from the right-hand side, for example, and this task becomes… » 2/16/12 8:35am 2/16/12 8:35am