4 ms·
Not that surprising. For humans, unlike for computers, adding and subtracting are different concepts. Think about how most people would transform "-3 + 7" into
by 323 5y ago
Not that surprising.
For humans, unlike for computers, adding and subtracting are different concepts. Think about how most people would transform "-3 + 7" into "7 - 3" and only then compute, because it's easier to "reverse" the operation than work with negative numbers.
- jimmygrapes 5y agoI'd be interested to see what difference, if any, there is in people who learned addition and subtraction in fundamentally different ways. Number line vs counting grids, pattern based, mental imagery, etc.
- ganzuul 5y agoAnd one is learned after the other. If you learned the same thing twice, it would probably not show up as two things.
- andbberger 5y agoIt's not that surprising, but not for that reason (to a neuroscientist). While the circuit implementation for subtraction is non-obvious, the circuit implementation for addition is and with Dale's 'law' in mind, even without knowledge of the subtraction circuit it is a very reasonable hypothesis that it would be implemented by a different circuit than addition.