For what it's worth, the upper limit for subitization varies quite a bit. The neurotypical limit is usually four, but can be raised with practice. Children wit

For what it's worth, the upper limit for subitization varies quite a bit. The neurotypical limit is usually four, but can be raised with practice. Children with Down's Syndrome may not be able to subitize at all. Autistic savants can subitize up to thirty or more, with unconfirmed cases up to several hundred.