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The following lesson is a great introductory activity to a unit on Memory. A teacher can model the activity by sharing some personal memories. If students have gone to school together, there will be many shared memories.
The memories should create some exciting and entertaining discussions.
Psychology Memory and Thought: Memory Bank

The human mind is incredible. We store so much information in our long-term memory such as names, people, places, events, and memories. During this activity you are to list 50 personal memories. It can be of vacations, school activities, friends, movies scenes, your first bike, whatever. 50 may seem like a large number but as you will see, after just a little reflection, you will realize you this number is so low I should have assigned 500! Use the back if necessary.  (Your list only has to be worded so that you understand. It does not have to be complete sentences.)