The way you speak could reveal early signs of brain ageing

The voice of an individual may offer glimpses into their health and ageing process, according to a recent study employing an automated system dubbed the "speech clock." Researchers from Trinity College Dublin discovered that certain speech features, such as tempo, pitch, and vocabulary, can indicate biological ageing more effectively than previously recognized.

To investigate this, they analyzed audio recordings from nearly 3,000 Spanish-speaking adults in Latin America, who underwent tasks like narrating a short film and recalling a story after a delay. The speech clock assessed hundreds of speech characteristics to compute an individual’s "speech age gap" compared to their actual age.

Healthy people had minimal speech age gaps, while those with dementia exhibited increasingly wider gaps. The study revealed that older speech scores correlated with indicators of accelerated ageing across various biological and clinical systems, including diminished brain structure, altered brain activity, and elevated levels of p-Tau217—a blood protein tied to Alzheimer’s disease.

Participants with older speech scores also underperformed on memory, focus, and problem-solving tests, indicating a connection between speech patterns and overall cognitive health. Unlike conventional measures like MRI scans or blood tests, the speech clock provides a low-cost, non-invasive, and remote assessment method accessible through standard devices, potentially serving as a valuable tool for evaluating multiple aspects of ageing without the need for specialized medical staff.

However, the researchers emphasized that the speech clock should not be considered a diagnostic tool for dementia and cannot predict future cognitive decline.