Hacker News new | past | comments | ask | show | jobs | submit login

> can tell you in half a second or less whether or not a number's even or odd.

Sure, but just because it takes half a second or less doesn't mean it's not reflecting mental performance. For example, testing reflexes takes even less time, down to tenths of a second, but yet, reflex time still correlates with IQ.

Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | Legal | Apply to YC | Contact