Dysfluency (Stuttering): Definition, Features & Management

Definition

Dysfluency (or stuttering, stammering) is a speech disorder characterized by disruptions in the normal flow, rhythm, and timing of speech.

Core Behaviors

• Repetitions: Sounds, syllables, monosyllabic words (“b-b-baby”).
• Prolongations: Audible extension of phonemes (“ssssnake”).
• Blocks: Silent fixation/cessation of airflow/voicing (“———cat”).

Accessory Features

• Physical: facial grimacing, eye blinking, head jerking, fist clenching, body tension.
• Secondary: avoidance behaviors (word substitution, circumlocution, situational avoidance), anxiety, reduced participation.

Etiology

Multifactorial: genetic predisposition (60–70% heritability), neurodevelopmental differences in speech motor control (basal ganglia, thalamus, cortical networks), linguistic demands, environmental triggers.

Assessment

• Speech-language pathologist: case history, stuttering severity instrument (SSI-4), OASES (impact), language/cognitive screening.
• Rule out cluttering, neurogenic stuttering (post-stroke/TBI), psychogenic.

Evidence-Based Treatment

• Preschool: Lidcombe Program (parent-delivered behavioral), Palin PCI.
• School-age/Adult: Speech restructuring (prolonged speech, gentle onset), CBT/ACT for anxiety/avoidance, fluency shaping + stuttering modification hybrid.
• Pharmacologic: No FDA-approved drugs; off-label dopamine antagonists sometimes tried (limited evidence).

Prognosis

~75% of preschool children recover spontaneously or with early therapy. Persistent stuttering into adulthood is manageable; many achieve effective communication with ongoing strategies.