普通の人は、3歳ぐらいまでのエピソードを思い出すことができません。これは専門用語では、「乳児期健忘（infantile amnesia）」とか「乳幼児期健忘（childhood amnesia）」と呼ばれています。（中略）乳幼児期健忘の原因については、記憶を司る脳部位の急激な成長や言語の獲得時期との関係など、諸説もろもろ提案されていますが、どれも決定版にはなっていません。
開一夫「日曜ピアジェ 赤ちゃん学のすすめ」p.76
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