ALS & AAC resources

Plain-language explanations of ALS, augmentative and alternative communication, and practical tips for staying connected as speech changes. These pages are educational only and don't replace advice from a doctor or speech-language pathologist.

What is ALS?

Amyotrophic lateral sclerosis (ALS), sometimes called Lou Gehrig's disease or motor neuron disease, is a progressive condition that affects the nerve cells (motor neurons) responsible for controlling voluntary muscles — the ones we use to walk, speak, swallow, and breathe. As these motor neurons stop working, the muscles they control gradually weaken and lose function.

ALS affects everyone differently. For some people, the first noticeable changes are in the hands or legs; for others, speech and swallowing (a pattern often called "bulbar onset") are affected earliest. Because ALS is progressive, someone who can speak clearly and type easily today may find both harder in the months ahead. This is exactly why many clinicians recommend introducing a backup communication method — even a very simple one — before it's urgently needed, rather than waiting until speech becomes difficult.

ALS does not typically affect a person's ability to think, understand, or remember. Cognition, hearing, and comprehension usually stay intact, which is an important reason AAC tools focus on giving people a way to express thoughts they already have clearly formed, rather than teaching new skills.

What is AAC?

AAC stands for augmentative and alternative communication — any tool or method, beyond natural speech, that helps someone express themselves. AAC is usually grouped into two broad categories:

• Unaided AAC uses only the body: gestures, facial expressions, eye pointing, or sign language.
• Aided AAC uses an external tool, ranging from a simple laminated letter board a caregiver holds up, to a dedicated speech-generating device with eye-tracking hardware, to a free web app like ALSChat running on a shared family tablet.

Within aided AAC, tools are often described as "low-tech" (paper boards, alphabet cards) or "high-tech" (software and dedicated hardware). Many people end up using more than one — a low-tech paper board as a reliable backup, and a high-tech device for longer conversations, texting, or speaking aloud to someone across the room.

Switch access and eye-gaze, explained

The hardest part of AAC usually isn't the vocabulary — it's access: physically and reliably selecting a letter or word when muscle control is limited. A few common access methods:

Direct selection

Touching, clicking, or pointing directly at the item you want. This is the fastest method when it's available, and it's how most people start.

Switch scanning

A device highlights choices one at a time — for example, cycling through five groups on a timer — and the user presses a single switch (which could be a button, a puff of air, or a small movement anywhere on the body that can still be controlled) at the moment the item they want is highlighted. This turns a selection that would need fine motor control into one that only needs a single, reliable action, at the cost of taking longer per letter. ALSChat's "auto scan" mode uses exactly this approach: it highlights each of the five letter clusters in turn, and a single click, tap, or spacebar press confirms the choice.

Eye-gaze / eye-tracking

A camera tracks where the eyes are looking, letting the user "point" at the screen with their gaze alone. This is often the access method of choice once hand and even switch access become unreliable, and it typically requires a dedicated eye-tracking camera and specialized software rather than a webcam. Many eye-gaze systems can be pointed at any switch-accessible on-screen layout — including a simple circular one — because the important thing is that targets are large, well-separated, and don't require fine precision.

Tips for talking with someone who uses AAC

Communicating well with someone who uses AAC is a skill for the listener as much as the speaker. A few things that consistently help:

• Slow down, don't finish sentences. It's tempting to guess and jump in once a few letters or words appear, but let the person finish their own thought whenever possible — guess out loud only if they seem stuck or invite it.
• Ask yes/no questions to narrow things down. "Are you thirsty?" is much faster to answer than waiting for a full sentence, and it's a good way to handle urgent needs.
• Keep eye contact with the person, not the screen. It's easy to end up watching the device instead of the person who's communicating with you.
• Repeat back what you understood. A short "So you want the window closed?" confirms you got it right and saves the person from retyping.
• Protect their setup time. If a device or letter board has to be repositioned, re-mounted, or turned on every time, that friction adds up over a day — a caregiver who keeps it charged and within reach makes a real difference.

Choosing between low-tech and high-tech AAC

There's no single right answer — most speech-language pathologists recommend having more than one option available:

• Paper letter boards never run out of battery and work even when a screen doesn't, which is why many people keep one on hand even after moving to a digital device.
• Free software like ALSChat is a good way to start immediately, on hardware a family already owns, especially in the period right after a diagnosis while a full AAC evaluation is being arranged.
• Dedicated speech-generating devices with eye-gaze hardware are usually the right long-term choice once hand and switch access are no longer reliable, and are often obtainable through insurance or an AAC clinic with the right documentation.

A speech-language pathologist who specializes in AAC can assess someone's specific motor and vision abilities and recommend the right mix of tools — and can also help with funding paperwork for dedicated devices, which is worth starting early given ALS's progressive nature.