Object Permanence

Object permanence:is the understanding that objects continue to exist even when they cannot be seen, heard, or touched.

It seems that when a baby hears a sudden sound they will look at the direction of the object. In this case the baby turned her attention to the rattling sound, once the object was covered with a cloth the object was "invisible". I have recently read that once an object "disappears" and can not be found, a child will give up trying and turn it's attention to something else, exactly how the baby in the video did.