Final answer:
Developmental stuttering, also known as childhood-onset fluency disorder, is a speech disorder that affects the fluency and rhythm of speech. It is not caused by lowered intelligence, intellectual disability, or cognitive disruption.
Step-by-step explanation:
Developmental stuttering, also known as childhood-onset fluency disorder, is a speech disorder that affects the fluency and rhythm of speech. It is characterized by repetitions, prolongations, and blocks in speech sounds.
It is important to note that developmental stuttering is not caused by lowered intelligence, intellectual disability, or cognitive disruption. It is a complex disorder that can have various causes, including genetic predisposition and environmental factors.