**TL;DR Summary:** In summary, this post discusses that the author (PhD researcher & speech therapist) is a former severe stutterer whose condition had been in stuttering remission for 10 years. In his book he discusses aspects of stuttering, including psychological impact, societal reactions, and therapeutic approaches. Stuttering can arise from genetics, such as slow speech planning, hypersensitivity to sensory feedback, and abnormalities in dopamine metabolism - but not sufficiently so for them (or their listener) to be consciously aware that their speech motor control abilities are impaired. Another subset stutters due to perfectionism without genetic predisposition. Stuttering is seen as the brain's way to prevent speech errors, with silent blocks (without pushing/tensing) being the primary symptom, where pushing, tension and repetitions are seen as secondary symptoms. He created the VRT (variable release threshold) hypothesis, which suggests that perceived errors (such as, anticipation / negative evaluation) increase the execution threshold to say a planned sound/word. For example, if we have high expectations to say our name more appropriately/perfectly (e.g., because we might believe that our name is more important to say). Then the execution threshold becomes too high to say our name, resulting in the dopamine levels not increasing high enough to reach the execution threshold. So, the speech plan not becoming sufficiently activated to make it available for motor execution. In other words, this execution threshold works as a quality control mechanism (or appropriateness regulator) to prevent the speaker from executing sounds that are likely incorrect or inappropriate.