From what I understand, if they are asked about let's say April 17th 2009 they linearly scan through all the April 17ths. So there is a filtering step that igno

From what I understand, if they are asked about let's say April 17th 2009 they linearly scan through all the April 17ths. So there is a filtering step that ignores all other 364 days. But they also don't start from their earliest memories so how does that filtering work?