I usually have a pack of gum and I deliberately start a pattern on how I take pieces out. Usually it’s from left to right, emptying a full row before I move on to the next.
My test is to offer them gum and see where they pick from. Will they recognize a pattern and continue it? Or will they be oblivious?
Either way, it’s not a measure of good or bad. It’s just a fun lil test.
One time a cricket was in the crack in the concrete just outside my sliding door and I could barely hear my game over the sound of this thing so I did what any completely normal mentally sane person would do and poured boiling water over the crack