Emma Mattes has given up on Siri. No matter how clearly or slowly Mattes speaks, the Apple iPhone’s iconic voice-recognition technology has been no help to the 69-year-old woman from Seminole, Fla. She struggles with spasmodic dysphonia, a rare neurological voice disorder that causes involuntary spasms in the vocal cords, producing shaky and unstable speech. Her car’s Bluetooth voice system does not understand her either.
