Stanford Study Links Persistent Math Struggles to Differences in How Children's Brains Select Strategies

Sixty-eight children between the ages of 8 and 10 sit at the center of a new Stanford University study on why some kids struggle with math year after year. Researchers led by Oliver Lasnick watched how these children approached math problems, how well they used different strategies, and what their brains were doing while they worked. The results appear in JNeurosci.

The question behind the work is a stubborn one. Developmental dyscalculia, a condition marked by ongoing difficulty with mathematical problem solving, has been recognized for years. But scientists are still trying to pin down the specific thinking processes and brain mechanisms that contribute to it. The Stanford team looked at one candidate: how the brain selects and manages strategies.

Solving a problem, the researchers note, takes more than knowing numbers or remembering arithmetic facts. A child also has to decide which approach will work best. One child might count individual numbers to reach an answer, while another uses a more efficient method built on a familiar mathematical relationship. As problems get harder, noticing that a different strategy is needed matters more and more.

On that front, children with developmental dyscalculia fared worse. Compared with children without the condition, they were generally less effective at using different strategies. They took longer to shift from one method to another, and they were less responsive when a problem's difficulty changed.

The study also found a difference over time. Other children became better at choosing appropriate approaches as they went. Children with dyscalculia did not show the same improvement. That suggests the trouble may lie not only in carrying out calculations but in deciding how to approach a problem at all.

The brain data added another layer. Activity within a particular brain system differed between children with dyscalculia and those who were more skilled at selecting and using strategies. These patterns were not incidental: they could predict how effectively children counted and how well they switched between approaches.

The findings point to abilities that reach beyond mathematics itself, namely attention, memory, and cognitive flexibility, the capacity to adjust thinking when circumstances change. Researchers often group such abilities under the label executive functions. They help a person organize information, stay on task, hold relevant details in mind, and change plans when something isn't working. In math, that can mean tracking numbers, comparing possible solutions, and recognizing when to try another method. The study suggests difficulties with these processes may contribute to dyscalculia.

There is an important limit. The connections observed do not establish that the differences in brain activity directly cause the condition. What the study offers is new evidence about the cognitive and neural processes associated with these difficulties.

Lasnick also stressed that dyscalculia does not appear to be one simple problem shared by every affected child. In his words, the study emphasizes the individual variability seen in the disorder, showing it reflects cognitive and neural dysfunction across multiple processes. The researchers argue that looking beyond whether a child reaches the right answer, to how that child chooses strategies and handles harder problems, could eventually help in identifying and supporting children with dyscalculia.