mentalism without props

What's the name of the effect where someone holds out their arms with their eyes closed, and the magician touches one arm, and the spectator says "now"? Then, when the magician goes to touch the arm, they don't actually touch it, yet the spectator still says "now" with their eyes closed, without having been touched.

https://youtu.be/pIcAW9BgrTQ?si=CM70H-mydQveVosg around minute 11:50 in this video