“Freud noted that adults do not remember childhood events occurring before they were as old as six. This period of childhood amnesia is now generally believed to end at about age three or four. Though current psychologists don’t put much stock in Freud’s explanation of the phenomenon (he believed the memories were repressed because they are too traumatic), there is still little agreement on what causes it. Gabrielle Simcock and Harlene Hayne of the University of Otago noticed that the period of amnesia tends to end at about the time of the onset of language, so they devised an experiment to test whether language ability might be at the root of the problem “