--- title: "Brain scans reveal mental number line for comparison and reasoning" url: https://newscentral.site/brain-scans-reveal-mental-number-line-for-comparison-and-reasoning/ language: en publisher: "News Central Site" section: "Science" published: 2026-10-22T18:00:00.000Z updated: 2026-10-22T23:24:43.554Z id: 0b3ae84b-52da-4e62-b980-716f9990b605 source: "Live Science https://www.livescience.com/health/neuroscience/brain-scans-reveal-number-line-thats-used-to-mentally-compare-values" attribution: "Link to https://newscentral.site/brain-scans-reveal-mental-number-line-for-comparison-and-reasoning/ and name News Central Site when you quote or summarize this story." --- # Brain scans reveal mental number line for comparison and reasoning A study published in PLOS Biology has found that the human brain uses a mental map to compare and reason about numbers, assigning unique coordinates to each number. Brain scans have revealed that our brains use a mental number line to compare and reason about numbers. This "mental map assigns unique coordinates to each number, allowing us to place them in order of magnitude. The research suggests that this system is flexible enough to combine different types of numerical values, such as whole numbers and fractions. According to the researchers, who conducted the study at the INSERM-CEA Cognitive Neuroimaging Unit in France, numbers are abstract concepts but our brains have ways of organizing them for comparison and reasoning. They said their findings show that the brain can bring together seemingly disparate numerical values within a common system. The research was published Thursday in the journal PLOS Biology, with the study's co-authors Daniela Valério and Stanislas Dehaene stating that what is fascinating about this discovery is the brain's ability to unify different numerical values. Brain scans have provided new insights into how the human brain processes numbers, revealing a distinct activity pattern in the anterior inferior parietal cortex that resembles a number line. The study involved 20 adults who were asked to compare numerical values, including fractions and whole numbers, and determine whether each was larger or smaller than the previous one shown. Brain scans using high-resolution functional magnetic resonance imaging (fMRI) tracked blood flow as an indirect measure of activity in the brain while participants worked on this task. The results showed that distinct activity patterns emerged in the anterior inferior parietal cortex as participants compared numerical values, with a pattern resembling a number line illuminating the region. The whole numbers and fractions were represented along this shared line according to their size, rather than being mapped separately. This shared map brings different number formats into a common system based on the quantities they represent, allowing the brain to unify disparate numerical concepts within a single framework. The research suggests that the activity patterns in the brain reflect not just the numerical value of fractions but also their relationship to whole numbers. For instance, a fraction like 1/4 contains the digit 4, but its actual value is much closer to zero than any whole number with the same digit. The brain's processing of this relationship between numerals and values appears to be more complex than previously thought. The study builds on existing research that has shown how the parietal lobe of the brain represents numerical magnitude. However, scientists have only recently begun to understand how the brain processes fractions in relation to whole numbers. Previous studies had already indicated that both fractions and whole numbers engage overlapping parts of the brain's number-processing network. This new study provides a more detailed understanding of how values are organized within this network. The researchers behind this study suggest that future work could involve examining how this neural representation of numbers changes across different demographics. This might include looking at individuals from various age groups and educational backgrounds to see if their brain activity patterns differ significantly from those observed in the current study, which only included native French speakers. Researchers have made significant progress in understanding how the brain processes numerical information by identifying a number line" that is used for mental arithmetic. This neural pathway appears to be active when individuals are asked to compare values and determine which one is larger or smaller. Studies have shown that this number line is not just a simple linear representation, but rather a complex network of interconnected areas in the brain that work together to facilitate numerical reasoning. The existence of this number line has implications for our understanding of how we learn mathematics and how numerical information is represented in the brain, which could potentially inform the development of new educational strategies. --- Source: [Live Science](https://www.livescience.com/health/neuroscience/brain-scans-reveal-number-line-thats-used-to-mentally-compare-values) Published by News Central Site: https://newscentral.site/brain-scans-reveal-mental-number-line-for-comparison-and-reasoning/