Brain's Decision Hub Dynamically Rewires Under Uncertainty
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- University of Iowa researchers published a Journal of Neuroscience study showing the frontoparietal cortex dynamically shifts its communication with other brain regions during uncertain decisions, rather than simply increasing activity.
- The experiment used fMRI and computational modeling with 38 participants aged 18–35 who learned color, face, and scene associations that researchers later altered to introduce uncertainty.
- Kai Hwang, associate professor of psychological and brain sciences and the study's corresponding author, described the frontoparietal cortex as an "air traffic controller" that filters and integrates signals from across the brain rather than passively collecting them.
- Stephanie C. Leach, a sixth-year graduate student in Hwang's lab, served as first author and led the participant experiments, while co-author Jiefeng Jiang led the computational modeling work.
- The findings could guide future research into ADHD and schizophrenia, conditions in which the source says this information-integration function may operate differently and contribute to difficulties regulating behavior in changing contexts.
- The work extends a 2025 study from Hwang's lab establishing that the frontoparietal cortex builds a high-level summary of incoming brain signals; funding came from the National Institute of Mental Health and the Iowa Neuroscience Institute.
Why it matters: The 38-participant study reframes difficult decisions: the brain solves them by rewiring which regions it talks to, not by burning more energy in one hub. That matters for ADHD and schizophrenia research, where the source identifies the same integration process as a likely point of failure, redirecting future investigation toward connectivity patterns rather than raw activity levels.
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