In a paper to be published online Nov. 18 in Nature, Karl Deisseroth, MD, PhD, a professor of bioengineering and of psychiatry and behavioral sciences at Stanford University, and postdoctoral scholar Melissa Warden, PhD, describe how they have isolated the neurons that carry these split-second decisions to act from the higher brain to the brain stem. In doing so, they have provided insight into the causes of severe brain disorders such as depression.
In organisms as complex as humans, the neural mechanisms that help answer the question, "Is it worth my effort?" can fail, leading to debilitating mental illnesses. Major depressive disorder, for instance, which affects nearly 20 percent of people at some point in life, is correlated with underperformance in the parts of the brain involved in motivation. But researchers have struggled to work out the exact cause and effect.
"It's challenging because we do not have a fundamental understanding of the circuitry that controls this sort of behavioral pattern selection. We don't understand what the brain is doing wrong when these behaviors become dysfunctional, or even what the brain is supposed to be doing when things are working right," Deisseroth said. "This is the level of the mystery we face in this field."
Clinicians refer to this slowing down of motivation in depressed patients as "psychomotor retardation." According to Deisseroth, who is also a practicing psychiatrist, patients may experience this symptom mentally, finding it hard to envision the positive results of an action, or, he said, they may feel physically heavy, like their limbs just do not want to move.
"This is one of the most debilitating aspects of depression, and motivation to take action is something that we can model in animals. That's the exciting opportunity for us as researchers," said Deisseroth, who also holds the D.H. Chen Professorship.
Psychiatrists, Deisseroth included, believe the will to act may be born in the prefrontal cortex — the foremost part of the brain that helps plan and coordinate action. It then zips through the brain as a series of electrical signals, passing from neuron to neuron along countless branching pathways until it reaches the nerves that directly implement movement. Until this study, however, it was not clear which of these pathways might control the willingness to meet challenges, or the anticipation that action might be worthwhile in a difficult situation.
To isolate these pathways relevant to depression, Deisseroth's team needed to stimulate specific brain cells in rodents and observe changes in their behavior. They used optogenetics, a technique Deisseroth developed at Stanford in 2005, which has since revolutionized the fields of bioengineering and neuroscience.
The secret is as old as green algae. These single-celled organisms produce a protein called channelrhodopsin that makes them sensitive to sunlight. Borrowing and engineering the gene for this protein, Deisseroth has been able to create neurons that respond to light delivered from fiber-optic cables. He can turn the neurons on and off by sending bursts of light to activate different areas of the brain and then observe the effects on behavior.
Surprisingly, the researchers found that simply stimulating the prefrontal cortices of rodents didn't motivate them to try any harder in a laboratory challenge. It turns out that motivation is not as simple as stimulating a region of the brain. Instead of one switch in the prefrontal cortex that turns motivation on, multiple switches work in concert. Some neurons excite motivated activity and others inhibit it. Broadly stimulating the executive part of the brain will not generate a simple effect on behavior.
"It's one step more subtle" said Deisseroth, "but this is something that optogenetics was very well-suited to resolve."
An optogenetic method called projection targeting allowed the scientists to work backward from the brain stem and find the exact pathway from neurons in the prefrontal cortex that signal motivation.
The researchers first introduced their light-sensitive protein into cells in the prefrontal cortex. The light sensitivity then spread out like the branches of a tree through all the outgoing connections and eventually made its way to the brain stem, making those regions light sensitive, too.
Then, illuminating the newly light-sensitive regions of the brain stem thought to control motivational movement, Deisseroth and Warden watched the behavioral effects as a subgroup of neurons in the prefrontal cortex that sent connections to brain stem were activated. They could see not only which cells are possibly involved in motivation, but the way motivation moves from one brain region to another.
The researchers suspected that one part of the brain stem in particular, the dorsal raphe nucleus, might be crucial to behaviors that control effort. This cluster of cells is a production hub for serotonin — a chemical messenger that changes the firing behavior of other cells. Serotonin is associated with mood modulation; many antidepressant drugs, for instance, may act by increasing serotonin concentration in the brain.
When the pathway between the prefrontal cortex and the dorsal raphe nucleus was stimulated, rodents facing a challenge in the lab showed an immediate and dramatic surge in motivation.
Curiously, however, when the rodents were relaxing in their home environment, the same stimulation had no effect. The pathway was not merely linked to any action, or to agitation; it was, more specifically, helping to "set the effort that the organism was willing to put forth to meet a challenge," Deisseroth said.
Researchers were also able to produce the opposite effect — reduced effort in response to challenge — by stimulating prefrontal neurons that project to the lateral habenula, a region perched atop the brain stem that is thought to play a role in depression. When this region was getting signals driven optogenetically from the prefrontal cortex, rodents put forward less effort.
These findings are part of a larger puzzle that Deisseroth and his team have pieced together by using optogenetics to model human behavior in animal subjects. The work has already helped clinicians and researchers to better understand what is going on in a patient's brain.
Connecting depressive symptoms with brain pathways may be helpful in the development of drugs, but according to Deisseroth, the most important part of this research is its insight into how motivation works in both depressed and healthy people.
He has observed that this insight alone can be helpful to those dealing with mental illness and seeking an explanation for troubling symptoms that feel deeply personal. For those patients, he said, simply knowing that a biological reality underlies their experience can be a motivational force in itself.
Other Stanford co-authors include graduate students Aslihan Selimbeyoglu and Sung-Yon Kim; research assistant Julie Mirzabekov; lab manager Maisie Lo; postdoctoral scholars Kimberly Thompson, PhD, and Avishek Adhikari, PhD; and former postdoctoral scholar Kay Tye. They also collaborated with Loren Frank, PhD, a faculty member at UC-San Francisco.
This research was supported by the Wiegers Family Fund, the Brain & Behavior Research Foundation, a Stanford graduate fellowship, a Samsung scholarship, a Berry Foundation fellowship, the National Institute of Mental Health, the National Institute on Drug Abuse, the U.S. Department of Defense, the Keck Foundation, the McKnight Foundation, the Yu, Snyder, Tarlton, and Woo Foundations, and the Gatsby Charitable Foundation.
The work was also supported by Stanford's Department of Bioengineering, which is jointly operated by the School of Engineering and the School of Medicine.
The Stanford University School of Medicine consistently ranks among the nation's top medical schools, integrating research, medical education, patient care and community service. For more news about the school, please visit http://mednews.stanford.edu. The medical school is part of Stanford Medicine, which includes Stanford Hospital & Clinics and Lucile Packard Children's Hospital. For information about all three, please visit http://stanfordmedicine.org/about/news.html.
The Stanford School of Engineering has been at forefront of innovation for nearly a century, creating pivotal technologies and businesses that have transformed the worlds of technology, medicine, energy and communications and laid the foundation for Silicon Valley. The school advances modern science and engineering through teaching and research. The school is home to nine departments, 245 faculty and more than 4,000 students, tackling the world's most pressing problems in areas like human health and environmental sustainability. For more information, visit http://engineering.stanford.edu.PRINT MEDIA CONTACT: Andrew Myers at (650) 736-2245 (email@example.com)
Andrew Myers | EurekAlert!
The importance of biodiversity in forests could increase due to climate change
17.11.2017 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
Win-win strategies for climate and food security
02.10.2017 | International Institute for Applied Systems Analysis (IIASA)
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
17.11.2017 | Physics and Astronomy
17.11.2017 | Health and Medicine
17.11.2017 | Studies and Analyses