In what language do deaf people think? I think in English, because that’s what I speak. But since deaf people cannot hear, they can’t learn how to speak a language. Nevertheless, they must think in some language. Would they think in English if they use sign language and read English? How would they do that if they’ve never heard the words they are signing or reading pronounced? Or maybe they just see words in their head, instead of hearing themselves?
Excerpts from Cecil’s reply:
The language of the deaf is a vast topic that has filled lots of books—one of the best is Seeing Voices: A Journey Into the World of the Deaf by Oliver Sacks (1989). All I can do in this venue is sketch out a few basic propositions:
The folks at issue here are both (a) profoundly and (b) prelingually deaf. If you don’t become totally deaf until after you’ve acquired language, your problems are . . . well, not minor, but manageable. You think in whatever spoken language you’ve learned. Given some commonsense accommodation during schooling, you’ll progress normally intellectually. Depending on circumstances you may be able to speak and lip-read.
About one child in a thousand, however, is born with no ability to hear whatsoever… The profoundly, prelingually deaf can and do acquire language; it’s just gestural rather than verbal. The sign language most commonly used in the U.S. is American Sign Language, sometimes called Ameslan or just Sign. Those not conversant in Sign may suppose that it’s an invented form of communication like Esperanto or Morse code. It’s not. It’s an independent natural language, evolved by ordinary people and transmitted culturally from one generation to the next. It bears no relationship to English and in some ways is more similar to Chinese—a single highly inflected gesture can convey an entire word or phrase. (Signed English, in which you’ll sometimes see words spelled out one letter at a time, is a completely different animal.) Sign can be acquired effortlessly in early childhood—and by anyone, not just the deaf (e.g., hearing children of deaf parents). Those who do so use it as fluently as most Americans speak English. Sign equips native users with the ability to manipulate symbols, grasp abstractions, and actively acquire and process knowledge—in short, to think, in the full human sense of the term…
The answer to your question is now obvious. In what language do the profoundly deaf think? Why, in Sign (or the local equivalent), assuming they were fortunate enough to have learned it in infancy. The hearing can have only a general idea what this is like—the gulf between spoken and visual language is far greater than that between, say, English and Russian. Research suggests that the brain of a native deaf signer is organized differently from that of a hearing person. Still, sometimes we can get a glimpse. 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.”
I find that a fascinating idea, for some reason: dreaming in Sign.