How do I remember that I know you know that I know?

(PhysOrg.com) -- “I’ll meet you at the place near the thing where we went that time,” says the character Aaron in the 1987 movie Broadcast News. He and the woman he’s talking to have a lot of common ground, the shared territory that makes conversations work. Common ground is why, after you’ve mentioned Great-Aunt Mildred’s 80th birthday party once in a conversation, you can just refer to it as “the party.” In a new study to be published in an upcoming issue of Psychological Science, a journal of the Association for Psychological Science, the authors pinpoint the type of memory required to make common ground work and confirm that people with a particular type of amnesia have trouble making common ground in conversation.