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"When you ask a normal, right-handed person about something he's supposed to have seen, if he looks upward and to his left, he's truly accessing his memory of the incident," Bouton says. "However, if he looks upward and to his right, he's accessing his imagination, and he's inventing an answer."
Bouton says that left-handed people will usually have just the opposite reactions.
And some people will stare straight ahead when trying to recall a visual memory, he says.