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Anendophasia

The absence of inner speech — no internal monologue. Distinct from aphantasia but often discussed alongside it as another form of internal-experience atypicality.

Some people have a running inner monologue that narrates their thoughts; others experience thinking as something wordless. Anendophasia describes the absence of inner speech in particular.

There is overlap in the population — some people without visual imagery also lack inner speech — but the two are independent phenomena. Research on anendophasia is newer and less developed than on aphantasia.