Undamaged neighboring plants have been shown, in some cases, to respond to GLV signals. Both the plant emitting the GLVs and its neighboring plants can enter a primed state in which plants activate their defenses systems more quickly and in a stronger concentration.
The first study to clearly demonstrate anti-herbivore defense priming by GLVs focused on corn (Zea mays). Neighboring plants responded to the release of GLVs by priming against insect herbivore attack, reacting more rapidly and releasing greater levels of GLVs.  Similar results have been shown in tomato plants.  Neighboring plants reacted more strongly to GLVs from the plants exposed to the herbivore, by releasing more of the proteins related to the plants' defense mechanisms.