Which condition is characterized by a sudden onset and atypical secondary behaviors?

The condition characterized by a sudden onset and atypical secondary behaviors is psychogenic stuttering. This type of stuttering is often associated with psychological factors and can manifest suddenly, sometimes in response to stress or emotional trauma. Individuals may develop secondary behaviors, such as unusual body movements or tension, as a reaction to the stuttering episodes. These behaviors differ from those seen in more persistent forms of stuttering.

In psychogenic stuttering, the stuttering may not have a developmental history like that found in neurogenic stuttering or cluttering, and it tends to appear after a significant psychological event, making its onset distinct and noticeable. The presence of atypical secondary behaviors is another hallmark of this condition, setting it apart from other forms of disfluency. This is crucial because understanding the psychological aspects of speech disorders can lead to more effective therapeutic approaches.