Psychogenetic stuttering begins in the area of the brain that controls thoughts and reasoning. It's most commonly associated with mental illness.

心因性口吃始于大脑中控制思维和推理的区域。和精神疾病密切相关。

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During the interviews, the researchers asked parents whether their kids had been diagnosed with autism, ADHD, learning disabilities, cerebral palsy, seizures, stuttering or stammering, hearing loss, blindness, or intellectual disability (formerly known as mental retardation).

CNN: CDC: Autism, ADHD rates on the rise