What Is the 90-Second Rule for Dementia? And Why It Changes Everything

If you’ve ever watched someone with dementia seem to ignore a question, go blank mid-conversation, or respond to something you said a full minute ago — you’ve already seen the 90-second rule in action. You just didn’t know what you were seeing.

Understanding it changes how you communicate. And how you communicate changes almost everything about day-to-day care.

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What the 90-second rule actually is

It may take someone with dementia between 60 and 90 seconds to process information and respond to a simple request. Allowing ample time between your request and the person’s response will help alleviate frustration for the senior and the person providing care. So, if you’re asking someone with dementia to put on a jacket — make your request, and then allow 60 to 90 seconds before doing anything further.

That’s it. One to one-and-a-half minutes for a simple request to be processed.

For most of us, this feels like an impossibly long silence. We ask a question, hear nothing for ten seconds, and instinctively repeat it, rephrase it, or assume it wasn’t heard. Which means the person with dementia — who was still processing the first request — now has a second input to process. Which resets the clock. Which produces more silence. Which produces more repetition from us. Which creates a loop of confusion and frustration for everyone.

The 90-second rule breaks that loop.

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Why dementia slows processing this much

The brain changes caused by dementia affect the speed at which information travels between neurons, not just what gets stored. A simple question — “Would you like some tea?” — requires the brain to receive the words, decode their meaning, connect them to the concept of tea, retrieve an opinion about tea, formulate a response, and produce the words. In a healthy brain this happens in seconds. In a brain affected by dementia, each of those steps takes longer, and some require more effort than others.

What looks like ignoring is usually processing. What looks like confusion is often the gap between receiving the question and being able to respond to it.

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How to use it in practice

Make one request at a time. Don’t say “would you like to get dressed and then have breakfast?” Choose one. Ask it. Wait.

Use simple, direct language. Long sentences with multiple clauses require more processing. “Would you like tea?” is better than “I was thinking of making some tea — would you like some, or would you prefer something else?”

Don’t repeat the question during the wait. This is the hardest part. Silence feels like it needs to be filled. Resist the impulse. If 90 seconds passes and there’s genuinely no response, a gentle restatement is appropriate — but only once, and in the same words.

Watch for non-verbal responses. Processing may produce a physical response before a verbal one. A nod, a hand reaching toward something, a shift in posture — these are answers. Don’t wait for words if the body is already answering.

Don’t interpret silence as refusal. A pause is not a no. Many families have inadvertently trained themselves to read slow responses as resistance and respond with increased pressure, which makes everything harder. Silence is almost always still processing.

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The 90-second rule and the 90-second screening test — two different things

There’s some confusion online because “90-second rule” is also used to describe a brief cognitive screening tool used by some clinicians to identify early Alzheimer’s. The 90-second screening rule involves a quick series of questions asked in 90 seconds that can help identify patients who may need further evaluation.

These are two different things. The screening test is a clinical tool used by doctors. The communication rule is what this article is about — a practical approach that family caregivers use every day.

If you’ve come across this term in the context of your parent’s medical appointments, ask the doctor to clarify which they mean.

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What this changes at home

The 90-second rule sounds simple, but applying it consistently changes the texture of daily interactions significantly.

Mealtimes go better when requests are singular and unhurried. Getting dressed becomes less confrontational when one step is communicated at a time with space between them. Agitation during personal care — bathing, grooming — often decreases when the caregiver slows down and waits.

In the words of Teepa Snow, one of the leading dementia care specialists: “Dementia does not rob someone of their dignity. It’s our reaction to them that does.”

The 90-second rule is one concrete way to make that true in practice rather than just in intention.

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Teaching it to everyone who interacts with your parent

The value of this rule depends on everyone in your parent’s life applying it consistently — family members, caregivers, anyone who visits regularly. A professional caregiver who has been trained in this approach will naturally use it. A visiting sibling who hasn’t heard of it will instinctively rush through interactions, get frustrated, and conclude that your parent “isn’t having a good day.”

Worth sharing this article. Worth talking through it at the next family gathering. The single most impactful thing most families can do to improve day-to-day quality of life for a parent with dementia is slow down their own communication — and wait.

If you want help thinking through how to set up care at home in a way that actually works for someone with dementia, that’s what my care navigation call is for.

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Free resource: Get the BC Dementia Caregiver Kit — 9 printable templates including daily care logs, conversation scripts, doctor visit prep sheets, and more.

This article is part of the Aging at Home series. Also see: What Not to Say to Someone with Dementia · South Surrey Dementia Guide