This chapter examines the relationship between culture and social psychology, focusing on how internalized cultural meanings connect to action. It argues that social psychological constructs like knowledge activation, identity prominence, implicit knowledge, and third-order knowledge can help clarify the vexing issue of “cultural depth” in cultural analysis. By examining how individuals internalize culture through both declarative and nondeclarative modes, the chapter offers a more differentiated understanding of when internalized culture strongly or weakly influences action. The chapter concludes by arguing that a comprehensive explanation of cultural dynamics requires linking micro-level cognitive processes with meso-level situational mechanisms and macro-level institutional processes.