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The Latest Speech Generating Devices

More than 2 million Americans are speech-impaired because of a severe communication disorder. Today, a growing number of these individuals have found their voice through speech generating devices (SGDs)—electronic devices that talk for them. Several recent advances in SGD technology have made the devices even more powerful and accessible.

The simplest SGDs use digital speech—words or sentences that have been prerecorded by a human speaker. Specific messages can be retrieved and played back as needed. Such devices work well for many people. But for some, having to rely on a limited number of set messages is too confining.

That’s where text-to-speech SGDs come in. Users type what they want to say, and the device figures out how to pronounce the message using a complex set of rules for that language. The device then “speaks” the words using synthesized speech—an artificial simulation of the real thing. It doesn’t quite sound human, but it’s close. Today they’re available in a host of languages and some devices are even bilingual.

With SGDs, the machine may be doing the talking. But it’s the user who chooses what is said. Typically, this is done by typing on a keyboard, touching a screen, rolling a trackball, or tilting a joystick. But for users with very limited mobility, there are other options as well.

Eye tracking uses a sophisticated camera system to track the glint in a user’s eye. This allows the system to see where the person is looking on a screen. Then it directs a cursor to that location. After the user’s gaze has stayed on the same location for a set time—typically, somewhere between one-quarter-second and one second—the cursor clicks on that spot. In some systems, a blink can also activate a click. In this way, the user can select letters, words, or symbols to create a message.

Head tracking is similar. But rather than following the gaze of the eyes, a specialized camera tracks the movement of a small, disposable reflective dot that sticks to the user’s forehead or glasses. The user is then able to point and click a cursor with head movements. In essence, the “head dot” works like a wireless mouse.

The latest technology uses brain-computer interface (BCI), where the user wears a cap with electrodes on it. These electrodes are attached to an EEG machine, which tracks electrical activity inside the brain. “The person looks at a screen that’s flashing letters very quickly. When the desired letter flashes, the person’s EEG changes,” says Melanie Fried-Oken, Ph.D., professor and director of the Assistive Technology Program at Oregon Health and Science University. This triggers the SGD to select that letter. Dr. Fried-Oken is one of the researchers studying this new technology. She says it shows great promise for helping those who can’t voluntarily move any part of the body, sometimes even the eyes.

Certain speech-language pathologists (SLPs) are trained to evaluate and recommend SGDs within the field of augmentative and alternative communication. If you think an SGD might be right for you, an SLP can help you sift through the options and find the best match for your needs.

For the entire article, see: The Latest Options in Speech Generating Devices


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