(Oct. 16, 2017) -- How do we know if it was worth the wait in line to get a meal at the new restaurant in town? To do this our brain must be able to signal how good the meal tastes and associate this feeling with the restaurant. This is done by a small group of cells deep in the brain that release the chemical dopamine. The amount of dopamine released by these cells can influence our decisions by telling us how good a reward will be in the future. For example, more dopamine is released to the smell of a cake baking relative to the smell of leftovers. But does waiting change how dopamine is released?
A new study in Cell Reports by Matthew Wanat, assistant professor of biology at The University of Texas at San Antonio (UTSA), sheds light on how dopamine cells in the brain signal the passage of time. Wanat’s study used a technique called voltammetry to record dopamine release in rodents trained using Pavlovian conditioning. This task used two different tones that both predicted the delivery of a food reward. One tone was presented only after a short wait while the other tone was presented only after a long wait. Wanat and colleagues found that more dopamine was released to the short wait tone. These results highlight that when dopamine neurons respond to cues, faster is better.
“The big question that we’re focusing on is to identify the brain signals that influence the decisions we make,” Wanat said. “Many decisions are based upon comparing the value between cues associated with different rewards. There is a lot of evidence to suggest that these dopamine signals and external cues provide useful value-related signals that could inform our decisions to engage in a behavior.”
While Wanat and his collaborators are interested in studying how dopamine release is involved with cues triggering behavior, their work could also inform the understanding of drug addiction, which is closely intertwined with dopamine. Drug addiction can “hijack” the brain regions where dopamine is released. “By figuring out how the dopamine system works in normal and abnormal circumstances, we could potentially identify important changes and the ways that could target the dopamine system to rectify the consequences of those behaviors,” Wanat said.
“A lot has been said about the role of dopamine in reward, but reward is only really important in the context of making choices. Dr. Wanat's experiments allow direct measurement of dopamine acting in the brain during the process of choosing, and reveals how the brain decides the values of our choices,” said Charles Wilson, Ewing Halsell Distinguished Chair in Biology.
Wanat’s overarching research focuses on the brain’s relationships with memory, stress and drug addiction and how those components interact with each other. He is a member of the UTSA Neurosciences Institute, a multidisciplinary research organization for integrated brain studies with the mission to foster a collaborative community of scientists committed to studying the biological basis of human experience and behavior and the origin and treatment of nervous system diseases.
Wanat is one of 40 brain health researchers at UTSA, a group that includes experts in neurodegenerative disease, brain circuits and electrical signaling, traumatic brain injury, regenerative medicine, stem cell therapies, medicinal chemistry, neuroinflammation, drug design and psychology. Together, they are collaborating on complex, large-scale research producing a greater understanding of the brain’s complexity and the factors that cause its decline.
UTSA is recognized as one of the top five young universities in the nation by Times Higher Education.
Read Matthew Wanat’s study, “Dopamine Encodes Retrospective Temporal Information in a Context-Independent Manner.”
Learn more about the UTSA Department of Biology.
Learn more about the UTSA Neurosciences Institute.
Roadrunners get involved in fun, engaging and interactive experiences to gear up for the new school year.Various locations, Main and Downtown Campuses
The success of African Americans in popular sports has been well documented, while less attention has been given to their intellectual achievements. Utilizing historical, sociological, and cultural perspectives, Dr. Langston Clark will explore the intersection of Black Intellectualism and Black Athleticism.The Garage at the Pearl, 250 E. Grayson, San Antonio
Join the UTSA Small Business Development Center for its 5th annual day of immersion into digital marketing through seminars, Q&A sessions, and networking. Industry-expert presenters include Mark Nanez, Cory Ames, Charity Matthews, and Steven Bullard.Durango Building (DBB 2.316), Downtown Campus
With the cost of technologies declining, why has the cost of health tech continued to rise? Can hospitals afford the latest innovations? This FREE presentation will cover market needs and investment trends in Health IT.Durango Building (DBB 2.112A), Downtown Campus
This exciting event leading up to the UTSA Football season opener with Incarnate Word brings the coaches, players, bands, cheerleaders and fans from both teams together for a spirited pep rally on the San Antonio Riverwalk, which is free and open to the public.Arneson River Theatre, Downtown San Antonio
Home tailgate admission is free to all UTSA Alumni Association members. Non-member adult admission is $20 and children 16 and under are free. Anyone who wants to get Rowdy is welcome! Giveaways, music, UTSA Cheer & Rowdy, Pep Band and more!Alamodome Lot C, 100 Montana St., San Antonio
The Roadrunners open up 2019 play against hometown rival UIW Cardinals.Alamodome, 100 Montana St., San Antonio
The University of Texas at San Antonio is dedicated to the advancement of knowledge through research and discovery, teaching and learning, community engagement and public service. As an institution of access and excellence, UTSA embraces multicultural traditions and serves as a center for intellectual and creative resources as well as a catalyst for socioeconomic development and the commercialization of intellectual property - for Texas, the nation and the world.
To be a premier public research university, providing access to educational excellence and preparing citizen leaders for the global environment.
We encourage an environment of dialogue and discovery, where integrity, excellence, inclusiveness, respect, collaboration and innovation are fostered.