Ionic Scroll to a negative position

I have an ion scroll that scrolls accourding other component. To do that i use the function

scroll1.scrollTo(left, top, false);

However, this function doesn’t allow to scroll to a negative position like

scroll1.scrollTo(left, -50, false);

So is it possible to achieve this ?

My scroll must do scrolling without any user interaction (this is why i use the scrollTo function), and my main goal with the negative top position is to simulate a bouncing effect.