Tired troops may get a jolt from a late-night caffeine boost, but researchers at the Air Force Research Laboratory say they may have found a better way to fight fatigue.
A mild electric stimulation has proven in a research study of about 175 volunteers to be more effective for longer times than caffeine, said R. Andy McKinley, a 711th Human Performance Wing biomedical engineer in the Human Effectiveness Directorate.
“We found this really helps keep your attention on task,” McKinley said.
Imagery analysts, cyber and unmanned aerial vehicle operators, could be more alert with long hours staring at computer screens, and research findings suggest students could train up to twice as fast or more, researchers said.
“This would be a real benefit if we can accelerate that learning time, and our results have been really promising in that,” said Lindsey McIntire, a Human Performance Wing project research psychologist.
The technology could find its way into control rooms and classrooms within five years if the Air Force pursues the new fatigue-fighting method, McKinley said.
“I think we’re past the proof of concept phase and we’re trying to move toward something we can apply,” he said.
The technique is called trans cranial direct-current stimulation. Short term tests have shown few side effects, he said. But more research into the Air Force initiative, called Non-Invasive Brain Stimulation and tested on active-duty airmen at Wright-Patterson, is needed prior to fielding it.
“Basically, we need to understand what the effects will be of using this every day,” McKinley said.
The Wright State Research Institute expects to start similar experiments on student volunteers and airmen this spring in collaboration with Air Force research, said Michael P. Weisend, an Institute senior research scientist in the neuromedical imaging program.
“We will start to move this technology into more real-world situations,” he said.
Weisend arrived from the Mind Research Network in Albuquerque, N.M., to start the Wright State program.
“If you do this with carefully trained people in a lab setting, the risks are very low,” he said. But treatments at home by the inexperienced have in some cases led to burns or rashes, he cautioned.
The mild stimulation technique, narrowly focused on the brain, could be an alternative to pharmaceutical drugs spreading throughout the body and impacting other organs, he said.
“The normal solution to lots of problems we have with our brain is to take a drug,” he said.
The 711th Human Performance Wing has partnered with George Mason University, Georgia Institute of Technology and Duke University in the stimulation studies, also.
George Mason has for several years conducted trans cranial direct-current stimulation experiments on hundreds of college students and a handful of older adults, said Pamela M. Greenwood, an associate professor at the university in Fairfax, Va. The Air Force gave the university a $7.5 million, five-year grant in 2010 to study neuroergonomics, or how to improve how the brain functions at work, and in other settings, among other tasks.
Research shows potential to slow cognitive decline in later years. “If you could simply slow decline to allow people to function longer that would be a real benefit,” she said. It’s too early to reach definite conclusions in the university’s studies, however. The experiments on about 10 older adults weren’t funded through the Air Force, she noted.
At Georgia Tech, researchers have employed magnetic imaging resonance to scope areas of the brain best suited to sustain attention, said Eric Schumacher, associate professor of psychology.
“One thing that was novel was just how dynamic our brain systems were,” he said. “Even when we are trying to pay attention our brain systems are fluctuating in and out of trying to do that.” The university in Atlanta has sent students to work as researchers in the experiments at Wright-Patterson.
Experiments will start using trans cranial magnetic stimulation, or magnetic forces instead of electricity, to stimulate the human brain to spot images faster in photographs, said Bruce M. Luber, a Duke University experimental psychologist in Durham, N.C., collaborating in the research.
“There may be ways to train people to use this kind of technology to train people faster and get them better than they would be in the first place,” Luber said.
In a small lab room last week inside the U.S. Air Force School of Aerospace Medicine, Staff Sgt. William Raybon had one set of electrodes, wrapped in surgical mesh, on his right bicep and a second set on the left side of his head over the dorsolateral prefrontal cortex.
Looking at a computer screen blanketed with hollowed out red squares and blue circles against a field of white, he tapped a key on the keyboard every time he spotted a red circle. The screen changes every seven seconds while two small cameras under the screen track his eye movements.
A person wearing the electrodes may briefly feel a slight tingling, itchy or warm sensation, McKinley said. Seven percent of the research subjects have complained of a slight headache afterward, he said.
It was at least the fourth time Raybon, a medical lab technician, had participated in the experiment. He said he volunteered for out of curiosity and has had no side effects.
In a prior experiment, he stayed awake for 30 hours, then had the stimulation to test his response to perform tasks.
Afterward, the airmen “had no fatigue at all, really.”
“I was shocked by that because I’m not a morning person,” he said.
The Air Force study showed that people who stayed awake 30 hours, and then had a mild electric stimulation for about half an hour stayed alert another six hours compared to an hour or two after consuming caffeine, McKinley said. They had a better mood, were less drowsy and more energized, researchers said.
“Caffeine had a benefit initially but it went away pretty quick,” he said.
Researchers tested memory and reaction times between electric stimulation and caffeine and found no notable difference, McKinley said.