University of Iowa Study Reveals Dynamic Role of Brain’s Frontoparietal Cortex in Decision-Making Under Uncertainty

Research conducted at the University of Iowa sheds new light on how the frontoparietal cortex, a critical brain network, adapts to manage information flow during decision-making processes, particularly under uncertainty. The findings contribute to understanding how the brain organizes information and coordinates responses based on shifting situations.

The frontoparietal cortex acts similarly to an air traffic controller, integrating signals from various brain regions. It not only collects information but also filters it based on relevance, allowing the brain to respond efficiently to changing circumstances, such as encountering a road closure while driving. “Our study shows in more detail how the frontoparietal cortex operates — what kind of information it extracts from other systems and how it uses its connectivity pattern to integrate information coming in from different areas of the brain,” said Kai Hwang, the study’s corresponding author and an associate professor in the Department of Psychological and Brain Sciences.

In a 2025 study, researchers discovered that the frontoparietal cortex develops a high-level summary of incoming information, even when that information is incomplete or uncertain. This ability facilitates an organized response from other brain areas. Hwang added, “It’s like where other areas of the brain don’t have all the information, so they send what they have to the frontoparietal cortex for guidance.”

To deepen their investigation into this adaptive capability, the research team recruited 38 participants aged 18 to 35, who learned to associate different colors, faces, and scenes with specific responses. Later, the researchers altered these learned associations, introducing a level of uncertainty that required participants to adapt their responses accordingly.

During the experiments, behavioral data were analyzed alongside functional MRI scans to develop a computational model that identified how the frontoparietal cortex aggregates information from various brain regions. “Rather than simply becoming more active during difficult tasks, we observed how this network dynamically changes how it communicates with other brain regions depending on what information is needed at each stage of a decision,” Hwang noted.

The implications of this research extend to potential applications in understanding psychiatric conditions like ADHD and schizophrenia, wherein individuals may struggle with behavioral regulation when contexts shift. “These are situations where people struggle with regulating their behavior. If that integration function is not working properly, then that could very likely mean they didn’t use the right context to regulate their behavior,” Hwang explained.

Stephanie Leach, the study’s first author and a sixth-year graduate student in Hwang’s lab, expressed the value of the project: “Having the opportunity to conduct this research has been especially rewarding because it has allowed me to contribute to answering questions about the most fascinating, mysterious, and complex system we know — the human brain.”

The study, titled “Frontoparietal hub connectivity integrates information from multiple sources,” appears in the Journal of Neuroscience. It involved contributions from team members, including Jiefeng Jiang and Shannon Stokes, and was funded by the National Institute of Mental Health and the Iowa Neuroscience Institute.