Octavia Butler did not have direct speech or voice disorders, but she struggled with severe, near-paralyzing shyness and dyslexia. As a child, her reading and writing difficulties led teachers to incorrectly label her as "lazy," which contributed to feelings of isolation and a lifelong aversion to public speaking. [1, 2, 3, 4, 5]

Her personal struggles with communication heavily influenced her writing. [1]

• The Dyslexia: She was a slow reader and had to work significantly harder at spelling and grammar. However, she never let it prevent her from becoming an award-winning science fiction author. [1, 2, 3]
• "Speech Sounds": Her famous Hugo Award-winning short story, explores a dystopian world where a mysterious illness strips humans of their ability to speak, read, or write. Butler later noted that she conceived the story while feeling deeply depressed and exhausted from watching people around her struggle to communicate without resorting to violence. [1, 2, 3, 4, 5]
• Overcoming Shyness: Though she initially had a hard time speaking in public and was known as a "happy hermit," she ultimately grew into a sought-after speaker, lecturer, and influential voice in science fiction who traveled across the country to teach. [1, 2]

If you are interested in exploring her works that touch on communication and language, I can easily recommend some of her most acclaimed short stories or novels. Would you like a list?