Not sure about this, but it's interesting.

How to Use a Notebook to Make 2008 the Best Year Ever - Lifehack.org:

"Once a topic comes to mind, write it on your notebook and stop thinking about it. You’ve put it on your list so that you won’t forget the topic. You’ve put it on your list to clear you mind of that issue, thought, concern, action item ‘to do’, discussion, etc. Do not replay full discussions. If one comes up, write the topic and hit “pause” on your mental replay."