What kind of characteristic is most indicative of psychogenic stuttering?

The characteristic most indicative of psychogenic stuttering is the absence of a pattern of adaptation during reading tasks. Psychogenic stuttering often stems from psychological factors rather than neurological or developmental issues. One key feature of this type of stuttering is the variability in fluency that individuals exhibit, which typically does not show the usual improvement that others might experience when reading passages repeatedly.

In contrast, people with developmental stuttering often demonstrate adaptation effects, where their stuttering becomes less severe with practice. The lack of improvement in fluency during repeated reading can suggest that the stuttering is related to emotional or psychological issues rather than a primary motor planning or speech production disorder.

The other characteristics listed, while they may occur in various speech disorders, do not specifically highlight the psychological aspects of stuttering as clearly. Disorganized language and typical disfluencies are not unique to psychogenic stuttering, and a rapid speech rate may not necessarily correlate with the psychological roots of the stuttering. Thus, the absence of a pattern of adaptation is a strong indicator pointing towards psychogenic origins.