Some people lack internal monologue called anendophasia. Anendophasia impairs remembering phonetically similar words. Anendophasia hinders detecting rhymes from pictures. Inner voice helps repeat words mentally for memory. No differences in task-switching between groups. No differences in distinguishing similar figures. Anendophasic people use alternative strategies like finger tapping. Differences not noticeable in daily talk. Inner voice aids cognitive behavioral therapy. Anendophasics think in images or non-verbally. Study involved 100 participants split by inner voice strength. First study on anendophasia consequences. Anendophasics describe thinking as effortful translation to words. Brain like silent computer in anendophasics. Future research needed on therapy impacts.