The first group were females who had witnessed a predator attack and lost someone in that attack, and the second group were females who had witnessed an attack but had not lost someone.
Pirmajā grupā bija mātītes, kas pieredzējušas plēsēja uzbrukumu un tajā kādu zaudējušas, savukārt otrajā grupā – mātītes, kas pieredzējušas uzbrukumu, bet nav nevienu zaudējušas.