"Every time you recall a memory, you're basically making another copy of it and at that same point it is susceptible to new changes and adaptations. So, you know, if you remember from when you were, you know, in second grade and there was Christmas and you got a present from your grandfather and your mom was wearing a red dress, that may or may not all have happened."
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Source : "It's All In Your Head: Director Pete Docter Gets Emotional In 'Inside Out'". "Fresh Air" with Terry Gross, www.npr.org. July 3, 2015.