What language does a deaf person think in?

"The answer to this is actually really interesting. Assuming they were born deaf and learned sign language, deaf people actually think in sign. It’s gestures instead of sounds and their inner “voice” is entirely visual instead of audible. Oliver Sacks write about it in his book, “Seeing Voices: A Journey into the World of Deaf.”

Sacks writes of a visit to the island of Martha’s Vineyard, where hereditary deafness was endemic for more than 250 years and a community of signers, most of whom hear normally, still flourishes. He met a woman in her 90s who would sometimes slip into a reverie, her hands moving constantly. According to her daughter, she was thinking in Sign. “Even in sleep, I was further informed, the old lady might sketch fragmentary signs on the counterpane,” Sacks writes. “She was dreaming in Sign.”" -saturday-night-hemorrhagic-fever. 

Definitely on my list to read.