<<< Do not attempt to subitize the candy corn.
Subitize was coined in 1949 by E. L. Kaufman, et al., in "The Discrimination of Visual Number," published in the American Journal of Psychology. Later research found that babies can subitize quantities up to three. Adults don't do significantly better: most can subitize only four or five items. Chimpanzees can subitize up to six.
Can you subitize faster than a chimp? Take the test.