also be negative it can be zero basically meaning that you know it doesn't matter if they fire together i don't want to update the weight this particular weight in response to that so you can see that you can learn these rules that can adapt to different inputs because all of the changes the delta here is dependent on the inputs so on the correlation but also on the different inputs themselves and then there is also a constant right here okay this it's as you can see it's a linear function of the inputs of the oi and oj