Empirical evidence that concept mapping reduces neurocognitive effort during concept generation for sustainability

Abstract Sustainable development is a systems problem that requires a shift in thinking from individual parts to the relationships between them. Enabling those involved in the development process to more quickly think in systems is therefore vital to create more sustainable solutions. However, measuring the ability to think in systems is a challenge because of the limited methods to observe behavior or measure outcomes. Recent advances in neuroimaging offer a radically new approach to measure one's ability to think in systems. The specific technique, called functional near-infrared spectroscopy (fNIRS), captures the change in oxygenated blood in the cortical region of the brain, which is a proxy for elevated cognitive activation. In this study, engineering students (n = 28) performed both concept mapping (i.e., labeling concepts and drawing directional connections between them) and concept listing (i.e., generating a list of concepts without indicating relationships) related to grand challenges for sustainability. fNIRS captured the increase in oxygenated blood along the prefrontal and parietal cortex during both concept mapping and listing tasks. Self-evaluation and concept mapping scores were also captured and compared. Concept mapping led to significantly more concepts compared to concept listing. Concept mapping also required less cognitive resources (i.e., oxygenated blood) to generate more concepts. The region of the brain that received more cognitive resources is also significantly different when participants were using concept listing and mapping. Concept mapping directed more cognitive resources to the regions of the brain associated with cognitive flexibility and decreased cognitive resources in regions associated with visuospatial processing. Self-evaluation of systems thinking was negatively correlated with concept mapping scores, meaning students with high perceived ability produce worse concept maps. Global efficiency of brain networks was positively correlated to concept map scores and more accurately measure performance compared to self-evaluation. This study provides neurocognitive evidence to support the benefits of concept mapping and also demonstrates the added advantages of neuroimaging to study systems thinking.