Back to Resource Library Rough & Tumble Play Pellis, Sergio, Pellis, Vivien · 2010 ★ NIFPlay Rating: 10 Rating Scale 10 Rigorous play-specific science 6–9 General biological science 5 Sound play research (uncontrolled) 1–4 Less rigorous / indirect 0 Indirect but high value Pellis and Pellis's comprehensive review of rough-and-tumble play across species, covering its neural substrates, developmental trajectory, adaptive functions, and role in social brain development. View Resource