Human: I've heard that there are a number of different types of stutters. What are the most common types? Assistant: 
The most common types of stutters include developmental, neurological, and psychogenic stutters. Developmental stutters occur when children have difficulty producing certain sounds or words due to their age and experience level. Neurological stutters can be caused by damage to certain areas of the brain, such as the frontal lobe or cerebellum. Psychogenic stutters are caused by anxiety or stress in the individual, and may result from a combination of factors including physical or mental fatigue, trauma, and depression.