Our recent results show that expanded inner speech is slightly faster (0.6 secs) than outer speech. 16 of 20 participants followed this group finding. We now hypothesize that when outer speech is slower, it is because of the time taken to move the vocal tract structures.

We also speculate that the rate expanded inner speech is the same as the rate of verbal thought.

Two caveats need to be addressed in future research: (1) type of inner speech used; expanded vs. condensed (after Fernyhough, 2004), and (2) type of speech task used (recitation vs. "thought driven").
Fernyhough, C. (2004). Alien voices and inner dialogue: towards a developmental account of auditory verbal hallucinations. New Ideas in Psychology, 22, 49-68.

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