Subtle changes in an individual's voice may serve as an early warning sign for dementia, according to a comprehensive study analyzing the medical records of over 830,000 adults. Researchers found that individuals experiencing voice disorders, such as speaking less clearly, more quietly, or with pain, and who had no hearing loss, showed a 58 percent higher risk of being diagnosed with dementia or cognitive decline.
The study, published in the Journal of Voice and conducted by researchers at Drexel University, suggests this link may exist because the same neural networks responsible for cognition also control vocalization. When these networks begin to degrade, changes in voice could manifest before more recognizable symptoms like memory loss appear. Dr. Chandril Chugh, a neurologist not involved in the research, described the voice as a "real-time readout of very complex neural coordination," indicating that a decline in this coordination often shows up early in vocal patterns.
Voice disorders, which affect approximately 9.4 million Americans annually, can stem from issues with the structure, muscles, or nerves of the voice box. Potential causes include trauma, tumors, or nerve changes associated with various diseases. While anyone can experience a voice disorder, women, individuals over 60, and those with other neurological conditions are at higher risk. This increased risk in older adults may be partly due to factors like hormonal changes during menopause.
The Drexel University study categorized voice disorders into six types: changes in pitch, reduced speech clarity, altered volume, reduced vocal range, pain during speaking or singing, and other medically diagnosed conditions. Researchers also examined the relationship between hearing loss and cognitive decline, finding that individuals with hearing loss had a 27 percent higher risk of dementia or cognitive impairment compared to those without. This association is thought to be because reduced sensory input reaches the brain.
Interestingly, adults who experienced both a voice disorder and hearing loss demonstrated double the risk of dementia or cognitive impairment. The study authors theorize this could be due to more significant neural decline or increased social isolation, a known risk factor for cognitive decline, stemming from combined difficulties with hearing and speaking. Dr. Robert Sataloff, a senior author of the study and throat specialist at Drexel University, noted that voice problems can lead individuals to withdraw from social activities, which are important for cognitive health.
While the study identified an association, it did not prove that voice disorders directly cause an increased risk of cognitive decline. The findings were adjusted for factors such as age, sex, and high blood pressure. Limitations of the study include its broad inclusion of all voice disorders and a participant group that may not be fully representative of the general population. Future research is planned to investigate the links between specific types of speech disorders and cognitive impairment. Experts suggest that a voice change should prompt a thorough cognitive evaluation rather than serving as a standalone diagnosis. Approximately seven million Americans currently have dementia, a number projected to more than double by 2060.