Internal speech or thought; the mental process of language that occurs inside the mind without external vocalization.
From Greek 'endo-' (within) + 'phasis' (from 'phanai,' to speak). This psychological term describes the private language of internal thinking.
Endophasia is why you can 'hear' words in your head while reading silently—neuroscientists have discovered that your brain essentially talks to itself, activating the same speech regions even without sound, which is why we sometimes think 'out loud' in our minds.
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