(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.
UCLA education professor Pedro Noguera will lead the conversation. His research focuses on how schools are influenced by social and economic conditions. He is the author of eleven books and over 200 articles and monographs.Multidisciplinary Studies Building (MS 2.02.55), Main Campus
The ITC will livestream. Smithsonian Affiliations, the Museo y Centro de Estudios Humanísticos & the Conservatorio de Músico will bring U. S.-based scholars of Puerto Rican and Latino Studies to Puerto Rico to engage with local scholars about migration, music, art, literature, education, history, and diasporic experiences.Institute of Texan Cultures, Hemisfair Campus
Infection, Immunity and Vaccines discussed during this two day conference.The Eilan Hotel and Spa, 18603 La Cantera Terr., San Antonio
UTSA Department of Physics and Astronomy faculty and staff will conduct a presentation on recent developments in astronomy and astrophysics followed by stargazing in the observatory.Flawn Sciences Building (FLN 2.02.02) and Curtis Vaughan Jr. Observatory, 4th floor, Main Campus
The annual concert series begins the choirs and orchestra performing Dvorak's "Te Deum" . This concert is open to the public. Admission $10.Arts Building Recital Hall (ARTS 2.03.02), Main Campus
The second of three in the annual holiday concert series which will feature the Chamber Singers (Santa Baby), Saxophone Ensemble (Sleigh Ride), Jazz Ensemble (Sugar Rum Cherry), Flute Ensemble and more performing holiday favorites. Admission $10.Arts Building Recital Hall (ARTS 2.03.02), Main Campus
The Roadrunners close out the regular season at home against North Texas.Alamodome, 100 Montana St., San Antonio
This event showcases innovative student projects and research performed across multiple disciplines. The symposium is designed to provide a public venue where UTSA senior engineering students to present advances achieved in their design projects.H-E-B Student Union Ballroom (HSU 1.104/1.106), Main Campus