The ATNR (asymmetrical tonic neck reflex) shows up early in infancy. When a baby turns their head, the arm and leg on that side extend while the opposite side bends. This reflex helps with early coordination and visual development. But it’s meant to integrate as the brain matures. When ATNR remains active, the body may still want to move with the head – even during tasks that require stability. This can affect: • handwriting and pencil control • crossing midline • hand dominance • eye-hand coord

対称性・非対称性緊張性頸反射とは？出現・消失時期と確認方法