 In the first episode ever to feature Spocks parents, actors Mark  Lenard and Jane Wyatt asked Leonard Nimoy for advice on how the two  of them could display their affection for one another in a subtle  way since the Vulcans are without emotion since it was Nimoy who had  created the Vulcan Neck Pinch and the Vulcan Salute. Nimoy suggested  that they touch and stroke each others hands by the index and middle  finger.