Following a localized neurological event, 45-year-old Kaelen has experienced selective memory changes. If he is given a four-digit security pin to access his locker, he will forget it within seconds unless he repeatedly chants the numbers aloud. However, he can fluently speak Spanish (which he learned in school) and can vividly describe his wedding day from twenty years ago. Despite this, he is unable to remember the name of his new neuro-physiotherapist, whom he meets three times a week, requiring a reintroduction at every session.