Weird Javascript setInterval Scenarios in Chrome

This is a weird case.

function dummy() { . . . } setInterval(dummy, 1000); // This will WORK in non-Object-Oriented Function setInterval(dummy(), 1000); // This will not work as it has too many brackets setInterval("dummy", 1000); // This will not work setInterval("dummy()", 1000); // This will work even in a Object Oriented Function

I found when I tried to set an interval loop to a OO (Objected Oriented) Function as follows:

function dummy() { . . .    this.action1 = function() {       .       .       .    } . . . } setInterval(dummy.action1, 1000); // This will NOT work in Object Oriented Function setInterval(dummy.action1(), 1000); // This will not work as it has too many brackets setInterval("dummy.action1", 1000); // This will not work setInterval("dummy.action1()", 1000); // This will work even in a Object Oriented Function

The function without the quotes and bracket will not work. But it works well in a normal non-OO funtion.
This may be something trivial but it is interesting. I haven't tried anything other than Chrome yet. Maybe other browsers are not giving this problem.