How Mice Learn to Think Beyond the Box

A brain region widely regarded as the command center for flexible thinking may sometimes prevent animals from discovering a better way to solve a problem, according to a new study in mice. Researchers at Emory University found that the medial prefrontal cortex reinforced an established “win-stay” strategy even when the animals had access to a more efficient sensory cue. Temporarily suppressing activity in this region allowed the mice to abandon their habitual approach and learn a new strategy much faster.

The finding challenges the familiar view of the prefrontal cortex as an all-purpose engine of intelligence and adaptability. In humans, the region is associated with working memory, planning, decision-making, emotional regulation and cognitive flexibility. But the new research suggests that its influence can be context-dependent. Rather than always promoting flexible behavior, the medial prefrontal cortex may sometimes stabilize decisions based on previous experience, making it harder to respond to information arriving in the present moment.

The researchers studied a natural behavior in female mice: retrieving displaced pups and returning them to the nest. In the experiment, an adult female was placed at the base of a T-shaped maze while an artificial sound played from either the right or left arm. The sound acted as a beacon indicating where a pup would be placed. A mouse that followed the sound could reach the pup directly, but the animals initially relied on a different strategy. They returned to the maze arm where they had found a pup during the previous trial, regardless of where the sound was coming from.

This behavior is known as a win-stay strategy. It is often useful because repeating a successful action can conserve time and energy, particularly when conditions remain stable. However, it becomes inefficient when the environment changes. Over repeated trials, the mice gradually learned that the sound was a more reliable guide than memory of the previous pup location. Half of the 12 animals adopted the sound-based strategy by the fourth day of training, and all of them were using the auditory cue by the eighth day.

The experiment enabled the researchers to compare activity in two brain regions involved in the task: the auditory cortex, which processes sound, and the medial prefrontal cortex, which is involved in decision-making and behavioral control. The animals were implanted with silicon probes that recorded the firing of individual neurons while they navigated the maze. These recordings allowed the team to examine how neural circuits responded as the mice shifted from a learned habit to a strategy based on an external sensory signal.

The researchers then used chemogenetics to silence each region separately. This technique uses engineered receptors that can be activated by a specially selected drug, allowing scientists to reduce activity in targeted neurons without broadly disrupting the rest of the brain. When the auditory cortex was silenced, the mice showed impaired sound learning, although the ability was not completely eliminated. Animals that failed to form a strong sound association continued to depend on the win-stay strategy even after eight days.

The result was dramatically different when the medial prefrontal cortex was silenced. Instead of becoming confused or making random choices, most of the mice learned to follow the sound in only two or three days. In other words, disabling a region linked to executive control accelerated the adoption of a more efficient strategy. When the researchers restored medial prefrontal activity and repeated the task, the animals returned to their original preference for the familiar win-stay approach.

The findings indicate that the medial prefrontal cortex was not simply helping the mice make decisions. It was actively supporting a decision rule based on prior success, creating competition with the auditory system’s representation of the current cue. The researchers propose that this neural competition may explain why a behavior that is initially useful can become resistant to change. A circuit that emphasizes past outcomes can suppress the influence of new information, even when that information offers a faster route to the goal.

The study may offer a new perspective on human behavior, including conditions in which people have difficulty shifting attention, abandoning routines or responding to changing circumstances. The authors emphasize that the mouse results cannot be directly equated with human neurodiversity or cognitive disorders, but they may help identify mechanisms that contribute to differences in executive function. The Emory team is now studying genetically modified mice carrying markers associated with autism and is working with collaborators to test related ideas in adults using non-invasive techniques such as transcranial magnetic stimulation. The long-term goal is to determine whether carefully regulating prefrontal activity could help people overcome maladaptive habits while improving their ability to use relevant external cues.

News Publication Date: 7-Aug-2026

Web References: https://doi.org/10.1126/sciadv.aeb3005

References: Science Advances, DOI: 10.1126/sciadv.aeb3005