Inhibiting intuition: Scaffolding children's theory construction about species evolution in the face of competing explanations

Acquiring the counterintuitive logic of how the mechanism of natural selection (NS) leads to the evolution of new species (speciation) represents a paradigm case of conceptual change. Given this, we examined children's intuitive preconceptions about speciation and their ability to construct, generalize, and retain an accurate understanding of the theory. We did so by conducting two multi-age, multi-session, and multi-measure intervention studies that assessed children's understanding of natural selection 4 times over three months using extended interviews. We also examined the role of Executive Function skills (EF) in these conceptual change processes. Distinctively, we explored whether—consistent with conceptual co-existence accounts—EF not only supports children's initial construction of a counterintuitive theory but also plays an ongoing role in the online reasoning of successful learners. Across two studies, North American children in Grades 2 (N = 34) and 3 (N = 34) were provided with coherent mechanistic explanations of NS through a two-storybook intervention sequence. The first storybook described the logic of NS to explain how a specialized body part evolved within a fictional species (adaptation). The second storybook extended the logic to explain how this same species evolved into a new, distinct species (speciation). Findings revealed that many second and third graders were able to learn and generalize the logic of speciation. This is a remarkable feat given that speciation conflicts with early developing essentialist and teleological intuitions, and defeats most adults. Our analyses also confirmed that constructing this counterintuitive theory draws heavily on children's EF capacities. They additionally reveal that once the theory is constructed, EF plays a continuing role in reasoning by inhibiting competing intuitive explanations that co-exist rather than being replaced during the process of conceptual change.