{Reference Type}: Journal Article {Title}: Investigating infant knowledge with representational similarity analysis. {Author}: Ellis CT; {Journal}: Behav Brain Sci {Volume}: 47 {Issue}: 0 {Year}: 2024 Jun 27 {Factor}: 21.357 {DOI}: 10.1017/S0140525X23003187 {Abstract}: Decades of research have pushed us closer to understanding what babies know. However, a powerful approach - representational similarity analysis (RSA) - is underused in developmental research. I discuss the strengths of this approach and what it can tell us about infant conceptual knowledge. As a case study, I focus on numerosity as a domain where RSA can make unique progress.