So the idea here is that the ants to the wall or the floor or whatever you call it that they're less likely to interact, and so the relationship between how crowded they are and how often they meet would be messed up.
実験の目的は アリ達は― 壁面や床面に あたる場所へ しがみつくのに必死で やりとりをする機会が減り アリの密度と アリ同士が接触する頻度の関係が めちゃくちゃになるか というものです