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Speech may disclose early clues about dementia

Talking more slowly than usual can be an early sign of cognitive decline

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Mark Huffman
Reporter

Mark Huffman has covered consumer issues since 2004, with a special focus on protecting and empowering older adults. A former news correspondent for the Associated Press Radio Network, Westwood One, and ConsumerAffairs, Mark brings decades of journalistic experience to RetirementLiving.com. He is passionate about giving consumers a voice and helping them make informed decisions. Mark has also created educational content, including Senior Scam Alert, a video resource designed to help seniors recognize and avoid fraud. He holds a B.A. from the University of Kentucky and lives with his family in Richmond, Virginia.
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Photo by Vitaly Gariev on Unsplash

Key Insights

  • Talking speed, not word-finding difficulty, may be a stronger sign of cognitive decline, a new Baycrest–U of T study finds.
  • Pausing to search for words appears to be a normal part of aging and is not strongly tied to brain health.
  • Slower overall speech — even outside of pauses — is linked to weaker executive function, a key marker associated with dementia risk.

Struggling to find the right word is a familiar frustration for many older adults, but new research suggests it may not be the red flag for dementia that people fear. Instead, a study from Baycrest and the University of Toronto indicates that the pace at which someone speaks could offer a clearer window into their cognitive health.

“Our results indicate that changes in general talking speed may reflect changes in the brain,” said Dr. Jed Meltzer, Baycrest’s Canada Research chair in Interventional Cognitive Neuroscience and the study’s lead author. He added that talking speed may deserve a place in standard cognitive assessments to help clinicians spot early signs of decline.

What the researchers tested

The study examined 125 healthy adults between the ages of 18 and 90 using three different assessments designed to tease apart aspects of language and cognition:

  1. A picture-naming challenge with distractions:
    Participants answered questions about images while hearing unrelated words through headphones. This tested their ability to recognize objects and retrieve their names, even under competing stimuli.
  2. A natural speech task recorded and analyzed by AI:
    Volunteers described two detailed pictures for one minute each. Researchers — in partnership with Winterlight Labs — used AI software to measure how fast participants spoke, as well as the number and duration of pauses in their speech.
  3. Standard cognitive testing:
    These assessments focused on executive function — the set of mental skills involved in filtering distractions, juggling information, and staying focused — which commonly declines with age and is associated with increased dementia risk.

What they discovered

As expected, word-finding slowed with age. But the decline in naming ability did not correlate with executive function or other cognitive measures. Pauses during speech — long considered a hallmark of cognitive strain — did not show a meaningful link to overall brain health either.

Instead, two factors stood out:

  • How quickly participants named pictures, and
  • How quickly they spoke in everyday speech

Both were strongly tied to executive function, suggesting that overall speech speed — not the pauses — better reflects the brain’s processing efficiency.

In short: Taking longer to get a sentence out may be more meaningful than stopping occasionally to search for a word.

Why it matters

Many older adults worry that searching for words signals impending dementia. This study offers reassurance: word-finding pauses appear to be a normal part of growing older.

However, a noticeable slowdown in everyday speaking speed could deserve more attention, as it may reflect changes in brain systems that support focus, problem-solving, and cognitive control.

What comes next

Researchers hope to follow participants over several years to determine whether speech speed can reliably predict cognitive decline on an individual level. If so, the findings could lead to more accessible tools — potentially even speech-based tests — to help clinicians identify changes earlier and offer interventions to maintain or improve brain health.

The study marks one of the first efforts to connect natural-language differences with cognitive abilities in otherwise healthy adults, opening the door to simpler, faster ways to monitor brain aging.