The concept of number emerges from the interaction of psychological, behavioral, and material elements of numerical cognition, collapsing the distinction between "abstract" and "concrete." This dual nature is evident in the Inca numerical system, where tools like the yupana integrate abstract numerical concepts with concrete…

Teachers' focus on their students' learning is considered central in high-quality, studentcentred university teaching. This frontline eye-movement research asks whether teachers' focus can be observed at the intersection of the visual and conceptual levels. It introduces a novel way to study teachers' visual attention combined with verbal…