Which type of fluency disorder is characterized by an organic cause?

Neurogenic stuttering is characterized by an organic cause, often resulting from brain injury, neurological disorders, or other medical conditions that impact speech fluency. This type of stuttering typically occurs in adults and can be associated with conditions like Parkinson's disease, stroke, or traumatic brain injury. The speech disruptions in neurogenic stuttering arise from a neurological issue rather than psychological or developmental factors.

In contrast, psychogenic stuttering is related to psychological factors and emotional distress rather than a physical or organic cause. Cluttering is considered a fluency disorder but is characterized by a rapid speech rate and unclear articulation, not linked to an identifiable organic condition. Developmental stuttering, often observed in children as they acquire speech and language skills, usually does not stem from an organic disorder but rather from a complex interplay of genetic, environmental, and developmental factors. Thus, neurogenic stuttering stands out as the fluency disorder with a clear organic basis, making it the correct choice in this context.