A person who experiences highly variable cognitive function is likely to be more infectious and experience more symptoms after exposure to a respiratory virus.
An experiment conducted by researchers from the University of Michigan, Duke University School of Medicine, and the University of Virginia has revealed that fluctuations in alertness and reaction time could indicate a heightened risk of viral illness.
“We all know that if we’re stressed, or haven’t slept enough, that predisposes us to have a less resilient immune system,” said Alfred Hero, the John H. Holland Distinguished University Professor of Electrical Engineering and Computer Science at U-M and corresponding author of the study in Scientific Reports.
“This is the first exposure study in humans to show that one’s cognitive performance before exposure to a respiratory virus can predict the severity of the infection,” he said.
Subtle variations in everyday cognitive performance can signal changes in brain states that are known to increase the risk of illness such as stress, fatigue, and poor sleep. The team wanted to measure cognitive function and explore whether it was predictive of immune performance after exposure to a respiratory virus. Cognitive variability, measured with an at-home, digital self-test, turned out to be very predictive.
The team studied a cohort of 18 healthy volunteers who took brain performance tests three times per day for three days and then were exposed to a cold virus known as human rhinovirus. The software provided 18 measures of cognitive function including reaction time, attention, and rapid switching between numbers and symbols, which were combined to derive an index of variability.
Cognitive Variability as a Predictor of Illness
“In the beginning, we didn’t find that cognitive function had a significant association with susceptibility to illness because we used the raw scores. But later, when we looked at change over time, we found that variation in cognitive function is closely related to immunity and susceptibility,” said Yaya Zhai, a recent Ph.D. graduate in bioinformatics at U-M and first author of the study. She and Hero led the development of the cognitive variability index.
The team assessed viral shedding by using a saline solution to wash out the nasal passages of participants. They determined the presence of viral infection and the quantity of virus in the fluid by growing the virus in a cell culture. As for symptoms, the team used the Jackson score, in which participants rated themselves from one to three on eight common cold symptoms.
“This is an interesting observation in a relatively small study. I hope that there will be a chance to confirm these findings in a larger, more definitive study,” said Ronald Turner, professor emeritus of pediatrics at the University of Virginia, who ran the experiment.
The team is optimistic that smartphone use could eventually help identify times of heightened susceptibility to illness, monitoring cognitive indicators like typing speed and accuracy as well as how much time the user spends sleeping.
The Future of At-Home Cognitive Monitoring
“Traditional clinical cognitive assessments that look at raw scores in a single time point often do not provide a true picture of brain health,” said P. Murali Doraiswamy, director of the Neurocognitive Disorders Program at the Duke University School of Medicine, who designed the neurocognitive testing portion of the study.
“At home, periodic cognitive monitoring, through self-test digital platforms, is the future of brain health assessment,” said Doraiswamy.
The experiment also discovered a few genetic markers that may indicate reduced immune function, which the team may explore further in future studies.
Reference: “Pre-exposure cognitive performance variability is associated with severity of respiratory infection” by Yaya Zhai, P. Murali Doraiswamy, Christopher W. Woods, Ronald B. Turner, Thomas W. Burke, Geoffrey S. Ginsburg and Alfred O. Hero, 30 December 2022, Scientific Reports.
DOI: 10.1038/s41598-022-26081-6
The study was part of a project funded by the Defense Advanced Research Projects Agency to discover whether it was possible to predict susceptibility to illness in soldiers. That project was led by Geoffrey Ginsburg, then a professor at the Duke Center for Applied Genomics and Precision Medicine, and he led the contingent of the team analyzing blood samples for biomarkers that could indicate susceptibility to illness.
Lumos Labs provided access to their online Neurocognitive Performance Tests but was not involved in the process of conducting the study or the publication of the report.
Hero is also the R. Jamison and Betty Williams Professor of Engineering, professor of biomedical engineering, and professor of statistics at U-M. Zhai is now a data scientist at VivoSense Inc. Ginsburg is now the chief medical and scientific officer of the All of Us research program at the National Institutes of Health. Doraiswamy is also a professor of psychiatry and medicine at the Duke University School of Medicine and an adviser to Lumos Labs.
U-M and Duke have filed for patent protection for the cognitive variability index.
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3 Comments
It may be that the conscious logical brain and the lungs use the same kind of sugars. It may also be that the brain overloads the lungs asking for a lot of oxygen and the lungs are stressed. Another systemic transversal variable is available water for oxygenation. I hope this can help, recent studies in functional hypersensitivity disorders have found it.
I’ve found from personal experience that complex thinking or continuous thought provoking information from a documentary or book tended to have a positive immune system response and gave more of a sense of healing during a cold or respiratory illness rather than fatigue or stress. Now in this case I’d say a monitoring software or algorithms to predict illness would be useless. For example not everyone who is physically multitasking or performing advanced skills or communicating aggressively with fast typing is under stress or becoming fatigued by worry or pressure to meet a deadline. One person’s experience may have a negative immunity response anothers maybe positive. I don’t see how anything artificial can know when this is the case. But it’s an interesting scifi notion. It would be too easy to isolate some sort of a pattern from the results of the test to imply many things I’m sure but nothing can account for all variables human ones most of all.
To add to my comment …I’d say if I was being alerted by an app that I was approaching susceptibility of illness. Being made aware of this may have a negative impact to induce worry/stress therefore manifesting illness , let’s say I was reading a chapter in a book that had a very intriguing twist that brightened my mood. A cold I was exposed to may not become inevitable if my positive mood from the book didn’t stress my immune system the way the app alerting me would’ve. Just something to consider with people trusting technology more and more it would be easy to be influenced by it instead of controlling your own mood and destiny.