Great reply! I agree with much of what you say. Regarding the brain activity. In a research study, they investigated the brain activity in people who stutter (PWS), they found that fluency achieved during choral reading results in similar brain activities as those found in normal fluent speakers. Various other research found that stuttering anticipation (i.e., a trigger) might lead to abnormal overactivation of the brain, and so differs from normal fluent speakers. Another research study found that adults accurately anticipate 90% of upcoming stuttering (which the researcher considers a self-fulfilling prophecy).