Number-action coupling across the lifespan: Sensorimotor foundations of numerical cognition.

A growing body of evidence suggests that aspects of numerical cognition interact with action systems, particularly hand motor control, although the strength and nature of this coupling vary across tasks, developmental stages, and cultural contexts. This narrative review synthesizes behavioral, developmental, comparative, and neurophysiological evidence to address four central questions: (1) how early the connection between number and action emerges and how it changes with development; (2) the extent to which education and culture shape number-action coupling; (3) how aging alters these processes and their neural substrates; and (5) what number-action interactions reveal about the broader organization of shared cognitive and sensorimotor mechanisms. Although the evidence remains heterogeneous, as causal demonstrations remain limited and effects are often task-specific, this review nevertheless suggests that number-action mappings are present from infancy, supported by overlapping parietal-frontal networks, and are progressively refined through motor experience. Across childhood, finger gnosis and fine motor skills scaffold numerical development, while cultural practices such as finger-counting shape enduring representational formats. In adulthood, numerical magnitude and action show a robust bidirectional influence, with converging neuroimaging evidence for shared fronto-parietal substrates. In older age, despite executive slowing and motor decline, number-action overlap appears preserved via compensatory recruitment, and embodied interventions show promise. Together, these findings support a layered account in which action systems contribute to scaffold and modulate numerical cognition across the lifespan.