subvocaliser

/sʌbˈvoʊkəlaɪzər/
noun
  1. A person who silently pronounces words in their mind while reading or thinking, often moving their lips or throat muscles slightly.
    • Many people are natural subvocalisers, especially when reading difficult or unfamiliar material.
    • The teacher noticed that the student was a subvocaliser, mouthing each word silently during the test.
    • As a subvocaliser, she found it hard to speed-read because she always said the words in her head.
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