Do Numbers Constitute a Sixth Sense?

"Numerosity is the appreciation of numbers with two core processes: subitization and fuzzy set comparisons. Subitization is the sudden recognition and differentiation among one, two, and three things. Human infants and monkeys can subitize but the limit appears to be three things."

Humans may possess a sixth sense grounded in an innate ability to perceive numbers. Primary senses are hardwired and operate automatically without learning, and numerosity is proposed to follow the same pattern. Numerosity involves two core processes: subitization and fuzzy set comparisons. Subitization enables sudden recognition and differentiation of small quantities, especially one, two, and three items. Evidence indicates that human infants and monkeys can subitize, with performance suggesting a limit around three items. This numerosity system is linked to dedicated neural architecture in the parietal lobes, supporting detection of “oneness,” “twoness,” and “threeness” across different kinds of objects and even imagined entities.

Read at Psychology Today