The same brain areas are used for spontaneous and rehearsed speech

This 2014 human study found:

“..(brain) areas that respond reliably during spontaneous and rehearsed speech production of the same real-world story are the same.”

This finding highlighted the difficulty a therapist or researcher may encounter in objectively determining another person’s reality.

If the listener relied solely on words and speech, they may not be able to tell whether what’s heard was a planned narrative or if the speech had some other origin. That’s why in Dr. Arthur Janov’s Primal Therapy, for example, the therapist is trained to look beyond the patient’s words to ascertain the feeling being expressed.

Also:

“Production of a real-life narrative is not localized to the left hemisphere but recruits an extensive bilateral network.”

http://www.pnas.org/content/111/43/E4687.full “Coupled neural systems underlie the production and comprehension of naturalistic narrative speech”

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